snake species, especially racers like Jeff stated. I have also found many eastern milk snakes under same exact type of AC. ( artificial cover ).
Black racers can be found throughout the day regardless of temps, best bet is to find one of the many trash piles around most parts of pine barrens and look under stuff. I have caught many under tarps as well, as a matter a fact that is where I found that box turtle, under a tarp while hunting for black racers in old bridge township NJ.
All, but one, of the MANY black racers I caught that was not utilizing or relating to AC, were captured at the edge(s) of a field, next to wooded areas that also provide cover.
I am quite sure they thermoregulate a lot and being diurnal are sun loving super metabolizing machines. Active forages have a home range that they live in and do not travel much on any given day out of that range.
They are more active then most snakes and probably have larger home ranges then most lye and wait predators.
The one, I caught in the middle of a field, on a hot summer day. This snake also did not use the flight behavior typical of the species. They do exhibit both fight and flight behavior. This 5.5 foot snake stood it's ground, VERY IMPRESSIVE SIGHT TO BEHOLD. I have not seen anything quite like it but that one time.
They are one of my favorite reptiles that are indigenous to New Jersey.
I have to agree with Jeff because, his experiences with this species matches my field observations.
Definitely an under rated snake. If you get one, they get VERY NICE looking after some quality feeding and some proper cage husbandry.
The draw back to this species is that they crap a lot and be forewarned they are also ophiophagus ( snake eaters ).
Good luck hunting! Also check areas closely associated with water. Most of the racers I have caught where not to far from some type of permanent water source.
Once again that tin roof rippled AC is some of the best for racers, also car hoods, doors, ect...
a small taste of the pine lands animal diversity:



Internet images from google.com




Avian vertebrata I call The Red Headed Pinocchio.

orchids

some Anurans....




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Thanks,
Frank Roberts
Roberts' Realm Of Reptile Research
