After humans, which species in (of?) the animal kingdom do you think is the most destructive to its environment, its own kind, other species, etc, and why do you think that is?

Any herbivore could be if there were not enough carnivores to hold the numbers in check.

Rodents like rabbits can create a desert in two years due to efficient breeding.

I think I might choose the rabbit - but I haven't done enough research so I don't know.

Black Widow Spider, have sex with her then die ....

Nup. I thought about it some more, and now I think it's probably cattle - because we humans breed so many of them that the methane in their farts contributes significantly to greenhouse gases and global warming.

Good question. :)

Thank you.

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Ferrel Hogs. They destroy the environment they will eat anything. States who have a problem with them don't bother with a season or limits. They tell hunter to kill them all.