Drawn and animated by the wonderful Sidgi, you can see the original here!
In my head, I've always pictured sergal tails as 1. being relatively heavy to better support the body and 2. behaving like a cat's. And as you can see, Ceryl isn't in the best of moods.
But then again, when is he?
(Sergals are (c) Mick39)
Link
FloraCat
Reminds me of this https://www.weasyl.com/submission/369979/2013-04-22-ask-keis-stuffs