Once lived with a pet store mgr and we had to bring home sick kittens for recoup and to not spread disease. We had mulitple 100 gallon long tanks in a one bedroom apartment with 5 cats and many, many lizard tanks of varied shapes, size, and content. The new kitten would be on information stimulation fear overload for about 5 hours. The resident cats would be suspicious, surround, sniff and hiss at which put the kitten conversely on edge and looking for a friend while trying to track all the fish movement out of corners of eyes.

My favorite thing ever there was to comfort the kitten and lay with it near the 100 gallons late at night. Once relaxed, inevitably they would leap up and try to get a fish, or better get the shit scared out of them when a fish would bash up against the glass at them. The next favorite thing was to hear about how this worldly week in out home turned a runt into the most affectionately outgoing of the litter, and it got even more intense when we would raise baby love birds for side cash and the new kittens would witness birds taking their first flight right into a wall and flutter about hanging onto edges of posters or pictures. The adult resident cats would sometimes stop the kitten from trying to pounce as if to say yeah the humans don't like us eating the flying things. This gif harks me back to when once I was running a laser pointer around the room high dishing out catnip when a bird took off, hit a 100 gallon dead on, and 3 cats, a kitten, a laser dot, a two Oscar fish all converged on the same point and subsequently ran off in horror to their own corner. Out aged oldest still cat watching from a chair, laughed. Literally never before or again heard a cat laugh. This exhale combo with a murmur, like a quick belt out of a "Ha" with no supplementary signs it was anything other than laughter.