I think the bigger question would be what if animals were like humans in regards to overeating? I think we could look to our pets... I think the danger there is that animals that would normally be predators would become the prey. I would tend to think that if animals behaved like us the food chain would collapse... Not a biology expert here but too many of one species and not enough of another usually causes trouble. Sounds a lot like the current state of affairs when it comes to humans...
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Just wait, soon fruit flies will become selfaware and set our nukes to self destruct. All the while they develop fatal neurotoxins to all other species and become the apex predator.
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