From the comments on an NPR article title "The loneliest plant in the world" about the last individual of a species of cycad tree that is male and has no known living female counterpart to reproduce:

"Brow Master (Browmaster68) wrote:

"It is interesting to note that the only species that tries to mate with the same gender is us humans (maybe there is a lesson for us)".

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Sorry, buy you're wrong. All the animals listed below have been confirmed to display homosexual activity. It's not as abnormal as all you bible-thumpers like to think.

African Elephant
Brown Bear
Brown Rat
Buffalo
African Lion
Caribou
Cat (domestic)
Cheetah
Common Dolphin
Orca
Marmoset
Racoon
Dog
Bison
Human Prea Chicken
Common Gull
Emu
King Penguin
Amazon Molly
Blackstripe Topminnow
Bluegill Sunfish
Char
Grayling
Bitterling
Swordtail
salmon
bearded dragon
fence lizard
desert tortoise
wood turtle
black spotted frog
salamander
Pretty much every insect in existence"

Well said Avi E. There's just no arguing with an extensive list. With reason and logic anyway.