I went for bear because its a more typical animal...
but dragon would work too

and Caspian as a magpie is a good image... especially as he would be the magician trying stuff out
--- Horseman Camp, before raid ---

M: I am telling you their defences are strong, we need a distraction to take this ciy

K: What do you sugest?

S: something big, and panic inducing that isn't us of course... image gets a beating if only 3 horseman show up

C: Oh! I know I have the perfect thing...just one minute *dashes into tent and starts rumaging*

the remaining horsmen stare at one another

K: CASPIAN! No dragons!!!
S: I don't see why not... dragons are fun

C: No, not dragons just something I picked up on that raid we did against those people who wore blue and had really shiny hair

M: that was four centuries ago, how do you still have anything from it

C: I knew it would come useful... it goes kaboom if i can mix it right...