Can peacocks be gay

I would have to say no to this. Peacocks as with most animals, mate for the sole purpose of reproduction. There are very few animals in the animal kingdom that actually have sex for pleasure. Peacocks mate with Peahens in order to fertilize the females eggs and reproduce, the do not do it for pleasure.

For a Peacock to be gay, they would have to understand the concept of sex for pleasure and not for reproduction only and as I said, most animals only have sex in order to secure their species (reproduce).

This isn't the best answer. There are male pair bonding examples throughout the animal kingdom. It seems that many male mammals pair bond for life, break routinely for reproduction and then return to their bond mate. There are also mammals that never reproduce, but seem only interested in same sex animals like themselves. Bonobo monkeys exhibit this type of behavior. Be careful here though, because while we can draw some similarities between our own sexual behavior and that of some mammals, there are no clear conclusions or direct correlations at present. Traditionally, animal researchers considered (because of their own biased homophobia), homosexuality in mammals to be just mutant anomalies. Recently, they realize their mistake and are studying the phenomena-stay tuned.