At first glance, this fat little fence lizard seems okay, but if you look a little closer, he's experiencing a temporary tail shortage.
When he scurried a little higher on to the treated power pole, his "shortage" became more apparent.
The lizard will grow the missing section back of course. Regeneration is an amazing ability that drops off as a species becomes more complex.
I suppose the champion regenerator is the sponge which can be put through a blender until broken into tiny clumps of cells. Afterwards, those surviving cells will actually clump back up into a "new" sponge. My favorite cartoon, SpongeBob Squarepants often has him regenerating and I always wonder of the kids watching think that's just a cartoon thing, or do they realize sponges REALLY do that.
Starfish are good at it too. Even a single arm of the starfish can grow a new individual as long as the arm contains some of the central disc area. Pretty cool. There's an oft repeated tale of oystermen in the Delmarva area "killing" the hated oyster sucking starfish that came up in their oyster hauls by chopping them up and tossing the remains overboard.
It turns out that is a really bad plan when you are trying to reduce the number of starfish ...
Higher critters like us are not very good at "big part" regeneration, but we can patch up ourselves pretty well. We are just too complicated (women, especially so :) for total regeneration from a simple piece.
A lizard's tail is a relatively simple structure and regeneration of it happens relatively quickly. He would not be able to regenerate other more complicated parts however.
For this lizard, choosing green power poles rather than oak trees may have contributed to his loss of tail. You can't ignore an oak bark camo pattern perfected over millions of years and expect to go unscathed.
I explained that to him and he zipped over to a nearby live oak and disappeared.