I had my black pastel,lay next to a rat pup when I first tried to make the switch from mice to rats..he layed next to it for like 20 mins after staring at it for well over an hour. The first 90 mins was him staring at it,the last 20-30 was cuddling then all I remember hearing was squeezing,since then any rat pup I put in,is taken out within a couple minutes now