I was trying to trigger the same output from Bard, and it answered correctly; they probably addressed that very specific case after it got some attention. Then of course I started messing around, first replacing "elephants" with "snakes" and then with "potatoes". And here's the outcome of the third prompt:

My sides went into orbit. The worst issue isn't even claiming that snakes aren't animals (contradicting the output of the second prompt, by the way), but the insane troll logic that Bard shows when it comes to hypothetical scenarios. In an imaginative scenario where potatoes have legs, the concept of "legless" does apply to them, because they would have legs to lose.