A little something about Flip
The episode "Blinded by Science" reveals something interesting about him: gills in the legs, heart in the stomach, even a brain in the knee!
Sure, his taxonomic classification may be "Animalia Chordata Mammalia Flippia", but to say his species is a chordate is ambiguous given the mismatched organs. Could he belong to a phylum that's convergently evolved to look like a human?