Camel ==> Dragoon

[ACKMAN]

Is it a camel? or maybe a goon?

http://es.youtube.com/watch?v=Fh9fvmatf94

[Thorn]

you're just a little bit late in realising.

[Steely Ann]

It's a fairly common 'stock' sound like the effect for the Fast Zombie yell in Half-Life 2, which is quickened to sound slightly different in-game.  The moan/WTFE is used commonly enough that I've heard it in several movies (and one song).  Grats on your keen senses though, OP.

Also, cocks

[mooseberry]

Also used in Age of Empires, as surprise, the camel.