Herp Queries with Bill Love: California Night Lizard
Why the Protection for the California Night Lizard?
Question: I’ve read that night lizards are protected in California and can’t be collected. This seems nuts because they’re as common as dirt in my area. Why in the world would such a common lizard be protected?
Marty Case, Campo, California
Chris Brown, USGS
California night lizards are protected in California.
Answer: Most people wouldn’t argue that your local night lizard, Xantusia henshawi, is rare or endangered. Anyone who’s spent a modicum of time in the field knows better than that. But what’s more in danger of being overly disturbed is the lizard’s habitat of granite boulders. A granite boulder—specifically, the thinly layered “skin” on its surface—can be ruined for millennia by the chipping off of its layers.
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As a granite boulder degrades, a process known as exfoliation occurs. Boulders are formed underground over tens of thousands of years, and when they are pushed to the surface their outer layers begin breaking loose as the pressure on them decreases. While the layers are still clinging, they create hiding places for night lizards and other wildlife species.
Prying the layers off to find lizards destroys this niche habitat for thousands of years to come, and that’s the reason for the protection bestowed upon this particular lizard, which used to be collected in large numbers for the pet trade before this law, and the captive breeding of numerous other saurians that are now available as pets, helped take the pressure off.
The Other Blue Dart Frog
Question: What is the blue dart frog that is not Dendrobates azureus? It’s normally green and black but is sometimes available in blue and black. I think it’s a color phase of a common species.
Heidi Stowe, Grand Prairie, Texas
D. auratus in Manoa Valley, Hawaii.
Answer: Several of the tiny frogs among the dendrobatids display some tinges of blue, including variations of Dendrobates tinctorius, but the only other species that leaps to my mind with the description you provided is the blue phase of D. auratus, which occurs in the wild from southern Nicaragua to northwestern Colombia. Several localities in Panama are home to blue and black specimens, and blue morphs show up in other populations, too.
Bill Love photographs herps in nature, writes and lectures. He assists his wife, Kathy, with her business, CornUtopia, and via his company, Blue Chameleon Ventures, leads nature tours to view herps in Madagascar.