Deer are funny looking when they fuck. The stud will gently approach the female standing on his hind legs, balancing himself using his hoofs, as he tries to find that elusive pussy in which to put his slim cock.
On the other side, horses for me are majestic in their look, build, personality, and that massive cock they pack! Best of all is the flirting a stud will perform while he's flexing his cock and sniffing/snorting her pussy. A stallion dominates a mare: from biting the mare on the neck to control her, to burying his cock in her, a finally the slow withdrawal of his HUGELY engorged cock head and the ensuing flood of cum that rushes out of that stretched pussy. There are few things that engorge my cock as effectively as watching a stud performing with such a massive dick!!