It’s not a super creative or interesting answer, but I’d be lying if I said anything other than the giant squid. That’s gotta be one of the wildest most alien things on our planet. Squid are already fascinatingly weird and now you’re telling me there are squids the size of a horse that fight whales at the bottom of the ocean? Amazing. Please stay down at the bottom of the sea where I am not. I know the colossal squid is bigger, but it’s cool that the giant one is probably the basis of some of our most enduring myths of sea monsters and the name “giant squid” just rolls off the tongue really well