I was trying to tame one with two megs nearby and once I gave one fish maybe ten of them started to huddle around me. I like to think that they were keeping the mega away almost like dolphins scaring away sharks
The first time I saw one of these, I was on a rock in the middle of the sea taming a Pteradon. It came close, scared me, and since I thought it was aggressive, I gritted my teeth and bravely killed it. Shut up, noob's mistake.