Board Thread:Movie discussion/@comment-26923065-20151031225057/@comment-25727858-20151119215034

Echo actually looks extremely similar to the Velociraptors in The Lost World: JP in my opinion, so it could be that Echo was actually bred using some frog DNA.

Maybe InGen/Masarani was experimenting with the other three JW raptors and used random animals' DNA to see how they would turn out. When they saw how much more multicolored and interesting Blue, Charlie, and Delta turned out, InGen decided to keep them. Just my little theory, though.