Are Some River Legacy Trees Haunted?

After a brief late summer hiatus, we are back! Fall is fast approaching and one of the many things people anticipate with fall is Halloween! Though it is only September, if you walk around the trails of River Legacy, you might notice that some trees look like they are covered in spider webs, and a lot of them. Is the forest getting ready for October 31st? While we would like to thing so, these webs are a really cool natural phenomenon.

Often confused with spider webs, these webs are actually made by the caterpillar of the fall webworm moth (Hyphantria cunea). These caterpillars can produce webs that sometimes cover huge swaths of trees. They measure about 1 inch long and start eating leaves immediately after they hatch from an egg mass. The web is produced to form a cover the areas where they are feeding. Host trees include mulberry trees, oak trees, pecans, sweetgum, redbud, willow, and many other fruit-bearing trees. Late summer and early fall but it seems to depend on the location. For example, trees in the southern part of Texas start appearing with these webs as early as April.

Right now, the easiest place to find these webs is in areas alongside Snider Creek on the eastern side of the trail adjacent to our new parking lot on Margaret Drive, at the main entrance to River Legacy Parks. But, keep your eyes open, because they have appeared in many other parts of our forest in previous years. So, while you might think, these trees are Halloween decorations, they are just mother nature’s work for all of us to marvel and learn!


The Many Benefits of Native Plants!

River Legacy Living Science Center is honored to be partnering with The Native Plant Society of Texas to help us restore, maintain and beautify our grounds using native plants. Member Josephine Keeney and her crew come once a month to plant and maintain beds around the Science Center and pond. If you are a regular visitor, you have probably seen the beautiful wildflowers along our pond.

Did you know that you can also add or convert your yard into a “native plant yard?” There are many benefits to incorporating native plants into your landscape, especially during the long, hot and dry Texas summers!

Why use native plants? They tend to be more tolerant of the climate and water availability for a particular area. Texas is considered to be home to about 5,000 native plants! Once established, these plants require little maintenance and are more drought tolerant than non-natives allowing the conservation of this precious resource. Just think, lower water bills!

Saving money is not the only benefit from having a native plant yard. Local wildlife is well adapted to them as food sources for seeds, nuts, fruit, and even eating the plant itself. Animals use them for shelters and habitats. Native plants support local pollinators who are vital for our food production. These plants are representatives of our regional biodiversity and preserve our history.

Where do we find them? How do I know what plant to put in the sun or in a shady or wet area? These questions and more can be answered by The Native Plant Society of Texas ( Their mission is to “promote research, conservation and utilization of native plants and plant habitats of Texas through education, outreach and example.”

There will be even more beautiful beds in the months to come at the Science Center. Keep your eyes open and come back to visit often to see the variety!

Red Yucca

Baby Praying Mantis!

Students in 3rd and 4th grades will be learning some amazing facts about insects in our Insect Investigators Summer Class this July! Did you know that summer is a very important time for the life cycle of many insects, especially the praying mantis.

Baby mantis seen against the backdrop of a leaf

Mantises (order Mantodea), first lay their eggs in autumn, which start to hatch in the spring. Late spring and summer, the nymphs (baby mantises) are in a period of growth and development and they tend to be seen more often because of this.  The babies hatch from an egg sac that is produced by the mother mantis using a special secretion from her abdomen. This egg sac is known as the ootheca. Color typically varies, but babies tend to be a different color than the adults. As the nymphs keep growing, they molt their exoskeleton. Depending on the species, some mantises can live from about 4 to 6 months but smaller species average a lifespan of only about 4 to 8 weeks.

When you visit the Science Center, look around the Turk’s cap plants on the outside terrace. Nymphs will tend to be underneath leaves or sitting on stems and they are fairly difficult to find due to their size and great camouflage. Nevertheless, with some patience, it is very possible that you will come across one. In addition, if you have children that would be interested in learning more about mantises and other amazing insects, our Insect Investigators summer class from July 15th to the 19th still has some open spots. Call 817.860.6752, ext. 102 to register or visit our website!

Spectacular Spiders: The Dark Fishing Spider

Dark fishing spider (Dolomedes tenebrosus)

River Legacy Park is home to hundreds of spider species. One very common spider species is the dark fishing spider (Dolomedes tenebrosus). This spider is primarily found on trees and it is most often seen in the month of May, although it can also be spotted all the way until September. Despite the fact that it is called a “fishing spider,” it does not live near water or fish. It is in fact, the most terrestrial, of the fishing spiders. It is quite big: females can measure anywhere from 15 to 26 millimeters whereas the males tend to be smaller, from 7 to 13 millimeters. The female produces egg sacs that can contain up to 1,000 baby spiders inside!

Spiders serve many purposes in the ecosystem at River Legacy, mainly prey control. It is estimated that all of the world’s spiders consume about 400 to 800 tons of prey each year! Spiders are also a great group of organisms for learning a wide array of concepts: predation, invertebrate biology,  how venom works, the amazing design abilities of the animal kingdom, etc.. Learning about spiders can help in reducing arachnophobia.

During our Spectacular Spiders Summer Class, students will learn all about spiders and why they are cool and interesting. Space is filling up quickly though so visit our website to sign up and learn more information. We hope to see your child there!






Update On Mexican Buckeye Tree!

Mexican Buckeye growing

Last November, through our brand new Saturday Conservation program, we planted a small Mexican buckeye tree (Ungnadia speciosa) provided by the City of Arlington with the help of some awesome volunteers. The tree was already roughly 4 feet tall and it was in a state of dormancy, meaning it had no leaves growing at the time. Fast forward to May and the tree is doing quite well!

Mexican buckeye is a small tree that grows in scattered places throughout central and western Texas, southern New Mexico, and northeastern Mexico. It grows to about 30 feet in height and produces beautiful, bright pink flowers. When pollinated, these flowers produce a capsule-looking fruit with 3 black seeds inside of it. Its seeds are considered poisonous for consumption. It is a great attractor for hummingbirds, butterflies, and other pollinators!


Mexican buckeye seeds

The planting of this tree could not have been possible without the amazing help of a handful of participants for our Saturday Conservation program. This program aims to educate and engage the public in issues regarding conservation and preservation of nature all around us.

Join us for the last Conservation Saturday program for this Spring on May 18th at 11 A.M. The topic will be all about reptile conservation, what the status of reptiles is in our area and worldwide and some ways people can help in reptile conservation. It is a FREE event though space is limited. If you would like to attend, you may give us a call at 817.860.6752 to R.S.V.P. If you would like more information about the program, you may call 817.860.6752 extension 125. We hope to see you all there. Information for Saturday Conservation days for the 2019-2020 year will be posted in the summer. Stay tuned!

Diversity of Plants

Spring time is the perfect time to go out and discover the variety of plant species found in River Legacy Park. Most plants at River Legacy are contained within the flowering plants, as are most plants around the world. These are known as angiosperms. They produce flowers and a fruiting body to protect the seeds once pollination has occurred. Species include the saw greenbrier (Smilax bona-nox), poison ivy (Toxicodendron radicans), osage orange tree (Maclura pomifera), Mexican plum (Prunus mexicana), etc. In addition to the flowering plants, there are 3 other major groups of plants with River Legacy representatives as well.

The mosses constitute a group of plants that like to grow in dense clumps on a typically moist surface. This could be a log on the ground, the bark of a tree, a bench, a boulder, etc.. They are non-vascular, meaning they have no system with which to transport a lot of nutrients and water. They are also very short and produce spores instead of seeds.

Ferns form the other major group of River Legacy plants. In contrast with mosses, ferns are vascular and are bigger. In addition, ferns have compound leaves divided into many leaflets. And, while ferns produce spores like mosses, these are located underneath the leaves of the plant instead of at the tip of the shoots. You might be able to find the bluntlobe cliff fern (Woodsia obtusa) along the trails near Snider Creek at the back of the Science Center parking lot. You have to look closely on the cliff itself to find this plant!

The gymnosperms is another group of plants that produce seeds instead of spores. The difference between them and the angiosperms is that gymnosperms do not produce a fruit to protect their seeds. Normally the seeds are in the form of a cone. One of the gymnosperms that makes River Legacy its home is the eastern juniper or red cedar tree (Juniperus virginiana). Look for a 16 to 60 foot tall tree with light reddish or brown bark with leaves that look like needles instead of a typical leaf shape.

Plants are awesome! We hope you will explore the trails surrounding River Legacy Living Science Center or in River Legacy Park so that you can enjoy them!

3 groups of plants are represented in this picture! Moss can be seen in the background, some ferns can be found at the top left-hand corner and in the middle right section, and a small flowering plant can be seen at the bottom right-hand corner!





Mammals, Reptiles, and Creepy Crawlers, Oh My!

Magnificent Mammals – Dec. 26!

Over the past couple of posts, we have talked about many of the mammals, reptiles, and other vertebrates that live in the woods of River Legacy. Often times, though, not enough attention is paid to the small critters (usually referred to as “creepy crawlies” or “creepy crawlers”) that often inhabit the forest floor. These include insects, arachnids, and other invertebrates.

Throughout history, these animals have traditionally been seen as scary, off-putting, or unpleasant for various reasons. But, in reality, the vast majority of them are just as fascinating as other more charismatic animals (mammals and reptiles), just as important to the healthof the River Legacy forest, and not aggressive. Many of these are decomposers and, thus, they form a key component of the energy flow in the forest. Several of them also prey on other animals that could be detrimental if their numbers got out of control. At the same time, many are important food items for other animals higher up in the food chain. The list of their attributions to the environment is endless. Join us to learn more about these Creepy Crawlers as well as mammals and reptiles during our Winter Break Family Fun Activities!

Radical Reptiles – Dec. 27!

As we wrap up another year (where did that time go!?) and we enjoy the holidays with time off work and in the good company of family and friends, it is a perfect time to learn more about these “creepy” critters (and other animals) and the very special place they occupy here at River Legacy Park and the Science Center. And, with that in mind, we invite you to River Legacy Living Science Center’s Winter Break Family Fun! From December 26 to December 28, you get to learn more about Magnificent Mammals, Radical Reptiles, and Creepy Crawlers. Get up close with some of our mammals, reptiles, and invertebrates followed by a related craft with time slots ranging from 10:30 am, 11:30 am and 1:30 pm. For more information on how to purchase your admission, you can visit or to check out a complete schedule of activities, click here. We hope to see you there!

Creepy Crawlers – Dec. 28!




Hibernation or brumation?

How do animals survive the winter? Winters at River Legacy tend to be milder than in most places around the country because of our location. Still, there are periods when the temperature drops to well below freezing and, sometimes, lingers there for days. Snow and ice events are also expected at least a couple of times during the winter.

Birds have adaptations for surviving the winter that are unique to them. We will talk about them in an upcoming post! For now, we are going to be focused on mammals, reptiles, and amphibians. All of these groups go into a state of dormancy during which they stop growing, grind their physical activities to a halt, and their metabolism significantly slows down. But there are differences in how each group does it.

Hibernation refers to the process mammals go through whereas brumation applies to

Reptiles, such as this red-eared slider (Trachemys scripta elegans), brumate during the winter

reptiles and amphibians. During hibernation, mammals go into a full state of sleep. They slow their breathing and heart rate down to almost full stop and rely on fatty deposit for their energy during this time. They do not wake up from hibernation at all until spring arrives. How do they get their fatty deposits? By eating more and more in the fall. Bats are really the only group that lives at River Legacy that truly hibernate. Other River Legacy mammals such as bobcats, skunks, fox squirrels, coyotes, raccoons, and opossums do not hibernate and instead just seek shelter in someplace warm and do not come out very much OR are able to be fairly active while winter lasts.

Bats, such as this Eastern red bat (Lasiurus borealis), are the only River Legacy group of mammals that truly hibernate.

Brumation, on the other hand, is the process by which reptiles and amphibians survive the winter. During brumation, these animals slow down as well but not to the point of almost stopping heart rate and breathing altogether. One key difference between brumation and hibernation is the fact that brumating animals are able to wake up from time to time in the middle of the winter. This is known as punctuated activity. Why do they need to wake up from time to time? Unlike mammals, which can survive the winter without water, reptiles and amphibians need it periodically. Another key difference is found in the method by which the animals obtain their energy. Mammals, as mentioned, rely on fatty deposits. Reptiles and amphibians instead use glycogen for their energy needs. Reptiles also can survive with very little oxygen during brumation because of this glycogen storage. Examples of River Legacy reptiles and amphibians that brumate include frogs, toads, snakes, and turtles.

If you would like to learn more about the winter adaptations of mammals and reptiles, we invite you to join our Winter Break Activities that are going to take place from December 26th through the 28th. For more information, please visit We hope to see you there!


Recent Bobcat Sightings

Bobcats (Lynx rufus) are well-known inhabitants of our woods! These cats are usually very secretive but, every once in a while, they are spotted walking openly on our paved trails where people can see them. Unlike most mammals, bobcats are still active despite the increasingly colder days. During fall and winter, they become more diurnal as their prey (rabbits and rodents, mainly) is more active at daylight during those seasons. So, it is possible that more bobcats are going to be seen in the next coming weeks and months. Bobcats, in general, are not aggressive species. It is incredibly rare for bobcats to present danger to people. Nevertheless, here are some things you should know if you happen to encounter a bobcat:

  • Stay within a reasonable distance of the bobcat. If you start getting too close to it, it might think you present a threat. Naturally, it would want to defend itself.
  • If the bobcat starts to walk toward you, which is incredibly rare, slowly start backing away. It is important that you do not run as this might scare the bobcat.
  • Do not touch or attempt to feed the bobcat. Bobcats are wild animals and you always want to minimize opportunities for them to bite. As it is the case with most wild mammals, wild bobcats may be rabid at times. Feeding any wild animal can cause harm to the animal, and there are plenty of food resources in River Legacy Park.
  • If a bobcat decides to walk by you, as long as you do not try to kick it or make sudden movements, the bobcat will just continue on its way.
  • Always have your pets on a controlled leash. The last thing you want is any altercation between a wild bobcat and your dog.
  • Be sure to take a picture and/or video of your bobcat encounter from a safe distance!

Seeing bobcats is a neat experience and if you find yourself in that situation and, as long as you follow these precautions, you will be able to enjoy being in the presence of these wonderful cats!


Bobcat (Lynx rufus) seen near the entrance of River Legacy Living Science Center last Saturday, November 10th, 2018!

Devil’s Cigar – A River Legacy Icon

Autumn is in full swing and this is the prime season for finding the sometimes elusive devil’s cigar mushroom (Chorioactis geaster). This mushroom is a very special mushroom because it can only be found in certain counties in Texas (Dallas, Hunt, Denton, Collin, Tarrant, Travis, Hays, Guadalupe) as well as two locations in Japan (Nara and Miyazaki prefectures). Tarrant county, of course, is the home of River Legacy!

This mushroom is found growing on or right next to stumps or dead roots of cedar elm (Ulmus crassifolia). It does not grow on any other tree here in Texas. In Japan, it has been seen growing on oak trees (Quercus spp.) as well as Japanese sapphireberry (Symplocos myrtacea). It essentially looks like a dark brown cigar but changes its appearance once it opens up to release its spores. When it does that, usually a hissing sound can be heard and eventually the mushroom looks like a star. This is why it is also known as the Texas star mushroom!

Mycologists (scientists who study mushroom and related organisms) do not yet know why it is found only in Texas and Japan. A 2004 genetic study showed that the two populations have been separated since at least the early Miocene (roughly 19 million years ago!) This rules out the possibility that humans could have moved from Texas from Japan or vice-versa. Therefore, it is still not known why it has a disjunct distribution. Just another interesting fact about this mushroom!

The devil’s cigar fruiting body usually appears between October and April since it prefers somewhat cooler and wetter weather. This year, it appears that the rain we have had for the past month is creating good conditions for it. We invite you to take a look around River Legacy Park and the trails around River Legacy Living Science Center to see if you can find a devil’s cigar fruiting body. Look around dead stumps of cedar elm trees. No worries if you can’t find it; You can always visit our Discovery Room, where you can interact with a replica of a devil’s cigar and hear for yourself the hissing sound it makes when it releases its spores!

Devil’s Cigar before opening.

Just starting to open.

Fully open.