i am disappointed in the lack of crazy beings.
I used the ducks and removed the effect cos i'm too noob for crazy ducks which turn people into ducks, crazy ducks are enough for me!
Rest seemed either too weird so far.
As a somewhat interesting one,
Tiny dragons which can shoot fire (perhaps at a less crazy rate than normal dragons?) but come in packs of 5-10 of them. Fairly easily breedable, war/hunt trainable, add likes_fighting too. Or if you're imagination gets bored, call it something else or make it interesting instead of a dragon. Above ground?! that would sure make embarking interesting and an amusing way of dealing with goblin attacks! (i.e just lock a door and wait for dragons to appear and wipe them all!)
Make it appear in all biomes. Make the same numbers (cluster/population/frequency) as ravens, i always get tonnes of ravens so the numbers should be perfect
If you're really bored, make something else which would be !!FUN!! for peoples forts as well. If not sure what, just use any animal: cat, cow, horse, scorpion, leopard, giraffe and add "insane/huge/mutated" in front, perhaps combine two animals.
About to start a new fortress very soon, so if you can manage something amusing for me, i would be most appreciative!
edit: I just imagined adding scorpion pincers and stinger to a cow, the result in my head was simply awesome. 4 legs, 2 pincers 1 stinger and another tail. A normal cows head, maybe larger?