Whales.
Its something about how graceful and beautiful and HUGE and social they are. I'm tearing up as I write this but thinking about their family structures, language and ancient migratory patterns really fucking gets me. I hope we figure out how to talk to the whales, I want to tell them I love them and I'm sorry for what we are doing to them.
Elephants do the same thing to me.
Fun Fact: H&K tried to sue over the external similarities. They claimed it was copyright infrigement but because it clearly is a different design they lost the lawsuit.