Preferred prey types is a very interesting subject. lets start with instinct, hognose when hatched, understand what is prey(food) and what is not. If they didn't the neonates would attempt to eat the water bowl, or lettuce or what ever, but they don't, they somehow know what to eat. there are certain keys that trigger that. So yes, hogs recognize, amphibs, lizards, birds, rodents, insects, turtles and turtle eggs, etc. Which means, somewhere in their genetic memory they ate those items to exist. In reality, didn't populations of the same species, can and do utilize different prey choices. Depending on whats available in abundance in that particular habitat. Are you following me, because now its going to get a bit sketchy.
Ethology is what keeps animals alive and living in a changing environment, and the environment is always changing. Either slowly or quickly. If you understand ethology and evolution, you will also understand that commonly adaption is always behind behavior and current conditions. Behavior attempts to keep up with changes, and is supported by adaption. Which means in this case, the fangs and venom at this time may indeed by remained. That is, no longer of current use in certain conditions. End pt2

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