Fittest Fish Evolution By Trygve BergJune 8, 2017June 8, 20178th Grade Science, Uncategorized Photo credit: HHMI BioInteractive In this film clip titled, “Making of the Fittest” scientists learn how fish can lose their pelvis and pelvic spines (which is equivalent to four-legged animals loosing their hind legs). Save Save TweetPinShare0 Shares