I've always loved rare and endangered small animal ever since I was 6, but I regret talking to a friend at the zoo and saying that Atlas beetles were the same thing as rhinoceros beetles. I missed some animals, but usually that was more of just my limit of staying at certain zoos, because I would have gone to some exhibits when I was younger at certain zoos but I just didn't have time.
The Biggest regret is Easily not taking photos of the animals that were such good opportunities to take photos of before at various zoos, Not with a phone, but the New camera I have now, which processes much more stunning and polished photos. Its not just in zoos but even in the wild I regret not taking photos of certain Insects I saw in the wild, owls, A coyote around 10-15 feet away from me, garter snakes, frogs, etc. This summer though I'm definitely going to use my camera to advantage so when I go out to look for insects and stuff at night like I normally do I'm going to bring my camera.