A jellyfish for sure! most likely the Turritopsis dohrnii. (or also known as the "Immortal jellyfish")
I think they're very interesting! Swimming along, forever, and ever, and ever.. unless I get eaten or diseased.
golden retriever.. or a rat!!!! Either or. I love rats so much and I've been fixated on them since 2017, golden retrievers are just one of my favorite dog breeds :-) and I like yellow coats very much. They suit me!