There is a wonderful community of naturalists in Fort Worth and surrounding areas, and some of us got together on April 28 to do two important things: add a little bit to our knowledge of natural history, and enjoy each other’s company. Nic Martinez, Clint King and I had offered to lead some activities at the Southwest Nature Preserve, a 58-acre patch of eastern Cross Timbers in Arlington. Nic knows a lot about the fish and other aquatic life of ponds, rivers, and other wetlands. He was there with several nets, ready to help participants take a look at what lives in the ponds at the preserve. Clint’s specialties are invertebrates and herps, and reptiles and amphibians are my first love. As so often happens in these events at Southwest Nature Preserve, other people who specialize in plants, birds, and other things were there as well. That’s the best thing about it. As we walk along, somebody mentions the odd presence of farkleberry, a shrub whose little flowers tend to hang downward, “like chandeliers,” someone says. The thing is that we are a little west of where farkleberry naturally occurs, supposedly, but here it is anyway. Then at the lovely whistling call of a bird, someone else says, “Listen – it’s a chuck-will’s-widow!” And later, as nightfall comes to the pond, I point out the calls of cricket frogs and bullfrogs. We all learn from each other.
This all happened on the weekend of the City Nature Challenge, a friendly competition held annually to see who can document the most wildlife and plants on citizen science platforms like iNaturalist. Among major U.S. cities, Dallas-Fort Worth turned in the most observations last year, and this year it is looking like we are among the top five in terms of the number of people involved, number of species seen, and the number of observations documented. People with tons of experience and people with little or no experience got out there, took photos of plants and animals, and posted them on iNaturalist, where the camera’s or phone’s metadata provided the location and time, and experts confirmed the identities of critters, flowers and trees. While technology took care of those details, we were free to re-connect with old friends and make new friends.
Nic started things off by gathering a few things that live in the ponds. Frogs have been calling and breeding, and he captured tadpoles that were probably going to be cricket frogs and leopard frogs (tadpole identification is not a simple thing, and can involve examining mouth parts and tail shapes, and so we could not confirm their identities). He also netted up the larvae of dragonflies and damselflies, tough predators with little of the grace and beauty of the adults – though I realize that “grace and beauty” are in the eye of the beholder. Later, at the pond with the boardwalk and fishing dock, he netted several sunfish. Don’t let the fact that they are common (“it’s just a sunfish”) distract you from the beauty of these fish with tall, disk-shaped bodies and spines in the dorsal and anal fins. Sunfish have scales that are green or bluish in places, yellow or orange toward the chin and breast, and all manner of blue or green squiggles or spots around the head and gill cover, that is, the operculum. The two I photographed were bluegill, one of our common sunfishes. Near the fishing dock, sunfish gathered in a large group of thirty or so, just below the water’s surface and probably hoping to steal a little bait off someone’s fishhook.
Blanchard’s cricket frog
Additional things seen around the ponds were Blanchard’s cricket frog – I netted a pretty one with patches of rust color on the snout and just behind the head – and a bee assassin, a type of assassin bug that may wait within a flower to ambush a bee, which it punctures with a straw-like mouthpart. I also took a photo of a pretty aquatic plant, some species of water primrose, that can form mats on the water with rounded, spoon-shaped leaves connected by red runners.
Rough greensnake (photo – Clint King)
The group of us took a late afternoon walk, with several members of the Friends of Southwest Nature Preserve as well as urban biologist Rachel Richter. Clint and his family caught up with us at the top of the ridge, and they had found a rough greensnake, which Zev held as several of us took photos and admired its graceful, lime-green body. A pale orange tongue and golden eyes round out the beautiful colors of this inoffensive predator of spiders and caterpillars. The snake was then taken back and released on the same bush on which it was found. We made our way around a small trail at the top of the hill, photographing standing cypress, the farkleberry mentioned earlier, and, lo and behold, R2D2 hiding behind some of the woodland understory. We did not post the photo of the little robot to iNaturalist, but we did have fun imagining what he was up to, out there in the woods.
“Help me Obi-Wan Kenobe, you’re my only hope”
The evening walk was a highlight, in part because of the mix of experts and nonexperts. One of the folks who joined us was a young lady who offered the opinion that she would just as soon not see spiders and snakes, thank you very much. Since these were two of the things we specifically planned to see on this walk, it promised to be an interesting time. I mentioned my own history of spider phobia that began with the time, as a child of about eight, when I gently maneuvered something soft out of a hole in the ground and it turned out to be a tarantula. I’m not sure the story helped a lot, but this brave person stayed with us for the walk. Right away, down by the biggest pond, Clint and Zev came up with a juvenile plain-bellied watersnake. As daylight faded, we examined this little snake by flashlight, and talked about the habits of this harmless species. This particular little snake took the handling and examination good-naturedly and was soon returned to its wetland. As it became really dark, we spotted a few spiders here and there, including a slender little one Clint identified as a long-jawed orb-weaver. We also saw a couple of six-spotted fishing spiders sitting on floating vegetation a foot or so from the pond’s edge. The larger females may reach nearly two-and-a-half inches in length, and they can rest on the water’s surface or even dive beneath to catch some unwary prey. A year or so ago, during a similar event at the preserve, Nic discovered a six-spotted fishing spider munching on a cricket frog, so these are pretty formidable spiders (though not dangerous to us). I suspected that a certain member of our party might be re-thinking her decision to come along on this night walk, but she hung in there like a champion.
Juvenile plain-bellied watersnake (Photo – Clint King)
We climbed up from the pond and walked around to the yucca meadow, listening to that chuck-will’s-widow as well as a screech owl. And on the way back, I found a Texas threadsnake (until recently, a Texas blindsnake) crossing the trail. Nighttime is when they are apt to be seen moving around on the ground’s surface, and the last time I led a night walk at the preserve, Zachary found a small one beside the trail. During the day, these primitive little pinkish-silvery serpents are prowling through ant or termite colonies, helping themselves to the soft-bodied larvae. We showed this one to the participants, and Clint talked about the snake’s secretion that repels ants and incidentally gives it that silvery sheen. We talked about its vestigial eyes, looking like small vague dots beneath the protective scales of the head, so that it can sense light and dark but probably not much else. Who needs good vision when you spend your days in the darkness of insect colonies? Someone also talked about the habit some screech owls have of taking live threadsnakes to their nests, where the snakes presumably eat tiny invertebrates that would otherwise bother the owls.
Texas thread snake – the head is in the lower part of the photo, with two vestigial eyes like small dots (Photo – Clint King)
Back at the parking lot, we all said goodbye. The woman who had said she didn’t want to see spiders and snakes thanked us, and I think she meant it. I hope she had fun, and that she was left with the perception that these are harmless and useful critters that can be admired from a few feet away without much worry. And all the other folks, the naturalists and nerds, we all went home with that satisfied feeling from being in the company of others who share an intense love of wild places, even on small preserves surrounded by urban development.