Congrats on the nice find. I was in Belize for a week last year in May, staying in a small village (Unitedville) with a friend of mine, and only found one snake while there, a Drymobius. We did find a nice big cane toad (the taxonomy escapes me) and some Ctenosaurs though. One thing in your post here caught my eye though. I'm under the impression that asper, rather than atrox, occurs in Belize. Am I mistaken here, or did you make a typo? I think the specimen at the Belize Zoo is an asper, and all their animals are either rescues or at least locals. I'm not trying to insult your intelligence or anything, just wanting to clear this up incase I'm able to make it down there again for some more jungle herping. A friend of ours in the village who does a lot of hunting took us to a place in the forest where he killed a "tommygoff" a week or so prior to our arrival. The skeleton remained, quite clean, and appeared very viperid to me. Of course, there's no way I could've made a proper identification to it, but I believe it was an asper (or maybe atrox now?).
By the way, speaking of tommygoff, have you noticed that the locals interestingly use this to describe any venomous, or potentially venomous, snake they see? There's the yellow-jawed tommygoff, which would be the asper, then the jumpging tommygoff, or Atropoides, and the tree tommygoff, or the schlegs. I just found this little tidbit interesting. At least it is somewhat descriptive of the actual species incase of a bite, even if they insist that the jumping tommygoff can leap 10' into a tree...heh.
Anyway, thanks for sharing the picture. By all means, post more if you have them.
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Chance Duncan
www.rivervalleyexotics.com