性不只是受制於人類：探索動物王國中的雙性戀行為

Sex is not just restricted to humans! All animals on this planet share a common ancestor. That's why it's not shocking that there are some bisexual (and downright libidinous) animals on the planet like humans. Here are 12 you may or may not know.

1. 大象：非洲象和亞洲象都經歷過同性性交和關係。雄性和雌性大象都被證明對同性伴侶的感情超出了性活動的範圍，例如將鼻子纏繞在一起並互相梳理毛髮。

2. 日本獼猴：眾所周知，日本獼猴表現出雙性行為，並探索與同性和異性的性活動。雌性獼猴經常追求同性性伴侶，即使它們正在被其他雄性獼猴追求。

3. Bonobos: These guys are the horn dogs of the animal kingdom. Bonobos sleep with both males and females and don't need an excuse to get down. Tired? Gender. Stressed? Sex. Angry? Gender. Feeling anything? Gender. Is it strange that they're the closest existing human relatives?

4. Orcas: Before sexual maturity, many killer whales play with each other and begin beaked genital orientation. Orcas do this to please their mates. Most of their homosexual behavior is mutual - they make sure that each 3-foot-long penis (yes) gets their undivided attention.

5. Wide-snouted dolphins: When they nicknamed the dolphins "gay sharks", they realized something. Many of these dolphins are bisexual or homosexual. This makes sense given that they are one of the most intelligent and social animals.

6. Penguins: Penguins are all different. Some are gay and monogamous. Some are bisexual in switching partners. Some people on the DL have a female partner, but there are also some partners from other males in the crew.

7. Black swans: About 251 TP3T of male black swans will mate with other males. They steal nests and fast trio (with females). When she lays eggs, they kick her out of the nest and raise the babies without her. Interesting fact: When raised by two males, baby swans have a better chance of survival than those raised by heterosexual couples. Maybe having two dads isn't so bad after all.

8. Flamingos: Can flamingos have same-sex relationships? Why we're not surprised. Last year, at the Edinburgh Zoo, a monogamous same-sex couple adopted a chick that had been rejected by heterosexual parents.

9. Giraffe: Practice makes perfect, which is why young giraffes "neck" (rub their necks to show dominance). After a neck battle, some young giraffes will court, caress, mount, and bump.

10. Western gulls: Gulls were actually the first birds to discover homosexual behavior. Up to 141 TP3T of female western gulls are said to be in lesbian relationships. This may be more of a necessity than an attraction; there is an apparent shortage of male gulls.

11. African Lion: The lion is one of the most sexually active animals in the animal kingdom. Scientists believe that riding another male can strengthen the bond between males and enhance the relationship.

12. Deep-sea squid: These rare creatures are bisexual, and are so for rather absurd reasons. Scientists believe that deep sea squid are firm believers in the "hole is a hole" method. Perhaps the search for a suitable partner down there makes gender identification difficult. They have to get it as far as they can.

These examples show that diversity in sexual behavior is not only found in human societies, but is also prevalent in the animal kingdom. These findings challenge our traditional views of sexual behavior and remind us that the diversity of the natural world is far greater than we ever imagined.