As Prosanta Chakrabarty explains in his TED talk, "Four Billion Years of Evolution in Six Minutes,":
"Knowing you're a fish and not a monkey is actually really important to understanding where we came from."
He also talks about how some of the ways we have come to think of "the theory of evolution" have hampered our understanding of the way life evolved, and the way (and the reasons) humans evolved; which has led to hilarious arguments between evolutionists and directed design believers.
I love his conclusion:
Here's the transcript of the TED talk. I couldn't find this talk on YouTube, which is why I didn't put a link to it here. To compensate, here's another talk by Prosanta Chakrabarty, on, you guessed it, fish. It's fascinating, well worth the short time it takes to watch. Enjoy!