u/amoleycat

"Who's a good kitty? You're a good kitty cat"

I didn't have the Sailfin Goliath buff active. I was just doing the Rising Pressure quest where you have to shut down the RDA drill site being set up near a Thanator with her cub.

After killing all the RDA (save for one clueless soldier some distance away from the main carnage), I followed the Thanators to go take pictures of them.

To my surprise, they didn't react to my character at all! It's so fun to watch their animations when they are not trying to kill you.