Thursday, May 24, 2012

A gathering of lizards

Where the lizards gather
 I've read that Western fence lizards (Sceloporus occidentalis) tend to be loners, defending their territory fiercely. There's a rocky place at Howarth Park where I like to sit and watch lizards, birds, insects and the occasional California ground squirrel go about their business. In winter the lizards are tucked away under rocks and in the ground but when the sun warms up those rock, the lizards come out of hibernation.

Fence lizards and a skink hanging out
One morning in early spring I arrived just as the sun hit the rocks and was pleasantly surprised to find a gathering of several lizards andl Western skinks (Plestiodon skiltonianus) hanging (literally) together on the vertical face of the rock. As I watched a few more emerged from holes in the wall and within an hour most had dispersed and could be found hunting within view.

Western fence lizards easing out of a tiny cave in a big wall of rock
Entranced, I returned several mornings in a row. The first couple of days the gathering was large. The weather became unseasonable warm and by the time I arrived (between 7:30 and 8 a.m.) the lizards were already out hunting. The skinks appear to come out later than the lizards and I was usually able to see them straggle out, sun for a bit and then glide off for some breakfast. After a few days, the gathering was much smaller but when I looked closely I could see lizards and a few skinks scattered among the rocks, hunting and defending territory.

Tuesday, May 15, 2012

Another slug

Reticulate tail dropper

A few weeks ago it had rained a bit and, as I sketched a Banana slug (Ariolimax columbianus) devouring the leaves of a Wild cucumber (Marah oreganus) plant, this little fellow ambled across the rock I was sitting on and buried itself in debris that had built up in a crevice in the rock. It was gone before I had a chance to sketch it but I lucked out the next day when I saw a white mushroom glowing in a patch of Poison oak (Toxicodendron diversilobum) and went closer to inspect it. Not only did I find fungi but I found two of these little slugs having a feast. I was able to pick up the mushroom and take it out of the Poison oak and sketch one of the slugs while it ate, then return the mushroom to it's original location with the slugs still attached.

Though slugs don't actually have tails this native species is called Reticulate tail dropper (Prophysaon andersoni) because they're able to self-amputate the back end of their bodies much in the same way that lizards release their tails when captured.

 Learn more about Tail droppers:
Identification Guide to Land snails and Slugs of Western Washington
Living Landscapes

Sunday, May 13, 2012

Slug and Manroot

Banana slug stealthily eating manroot leaves
A few weeks ago we were having unseasonably cold weather and I found myself looking, though unsuccessfully, for Banana slugs (Ariolimax columbianus) as I walked in the cold, gray early mornings. Then it got a bit warmer and rain gave way to blue skies and sun. I gave up on the slugs and went off to look at a Manroot or Wild cucumber plant (Marah oreganus) that I'd been admiring in a somewhat secluded rocky area.

Headed home for the day
I noticed an odd color in the depth of the plant and lo and behold! I'd finally found a banana slug! Wild cucumber produces upright stalks of small white flowers and the deer scat near the slug told me who had eaten nearly every flower off of the plant. As the sun rose higher in the sky the slug began it's journey home. I was thrilled because I've often wondered where these creatures go when the sun is out.
The slug moved slowly, producing enough slime, as it traveled, to help carry it safely over dried leaves, twigs and rocks. I had plenty of time to admire it's moves, contemplate the meaning of life and rearrange my bag. I was even able to plot it's course and identify it's home before it actually arrived at the small cave in the rocks and disappeared slowly into the dark.

A young banana slug
The weather remained cold for several days and I returned a few more times. In all, I found three different banana slugs eating the Manroot leaves at different times. One was quite small (3.5 inches long) and must have been a youngster. The other two were adults and easy to tell apart because one had almost no spots and the other had many.

It'll be a while before I see any of the Banana slugs again. During the dry summers here in Santa Rosa these native creatures estivate (the summer version of hibernate).

Think you know all there is to know about slugs? Think again:
 Slugs: A Guide to the Invasive and Native Fauna of California by Rory McDonnell
San Francisco State University Department of Geography
National Parks Traveler
Birds Amoré

Monday, May 7, 2012

Dressing up to do battle

One afternoon, at the end of March, I went looking for one of my favorite spring wildflowers, Marah oreganus, also known as Manroot and Wild cucumber. It sprawls along rocky places and I had recently discovered that it grows wantonly  in a partially quarried rocky area in Howarth Park. As usual, I had trouble figuring out how to draw this long, sprawling plant and was thinking about giving up when I heard a tiny ruckus on the next rock over. I looked up to see two Western fence lizards (Sceloporus occidentalis), in colors I'd never seen before, fighting and posturing with great vigor. I thought there might be a female involved and I soon found her, peering out of a crevasse on a ledge below the action. The males continued to interact with one another for quite a while. Then one of them left, only to return again, and they picked up where they'd left off. A bit later they both went to opposite ends of the slab and rested up for the next round. The female had climbed out of the crevasse and looked a bit exhausted, though she began to recover (from what?) before very long. As the males resumed their battle, a young lizard climbed up the to view the proceedings from the edge of the rock. One of the males chased him away and I watched as he headed my way, only to stop short when he noticed me noticing him. When I once again turned my attention to the territory struggle, the female had climbed up the cliff and was standing next to one of the males. The other male turned around and headed off slowly through the grasses at the edge of the battleground. I watched him until he disappeared and when I looked back at the victor and his mate, I was astonished to find that his brilliant colors and pattern had reverted to a pattern almost identical to her drab brown!