I have been wondering why God allows us to kill animals, now I have found the answer.
From the Wikipedia.
"Homosexual behavior in animals is sexual behavior among non-human species that is interpreted as homosexual or
bisexual. This may include same-sex
sexual activity,
courtship,
affection,
pair bonding, and
parenting among same-sex animal pairs. Research indicates that various forms of this are found in every major geographic region and every major animal group.
[1][2][3] As of 1999, about 500
species, ranging from
primates to
gut worms, have been documented engaging in same-sex behaviors.
[4][5] According to the organizers of the 2006
Against Nature? exhibit, it has been observed in 1,500 species.
[6][7][8]
By the way, are all these animals commenting a sin? 
