I was hanging out with my parents turtle Nostrils. I had found a significantly smaller toy about a quarter of the size of him that resembles a turtle and put it in front of him. I noticed that he went up to this toy, did a nose boop, and then started to puff himself up (all 4 legs, neck in between top and bottom shell) and wiggled his shell almost like a butt wiggle. I have never seen him do this. Usually he isn't afraid of anything or any toys and just walks over whatever is in his way, so it was weird to see him puff up his body like that.
I wasn't sure if he was doing this out of fear or something else so I took the toy away from him right away. Has anyone experienced anything like this?