Animal love: 8 weird ways species get it on

Editor’s note: It’s Valentine’s Day, when thoughts turn to romance — a complicated matter for us humans, but even more so for some of our animal friends. This Valentine’s Day, we asked Conservation International’s own Russ Mittermeier, a renowned primatologist and naturalist, about some of the more colorful mating habits of the animal kingdom. 

  1. Male parrots only get lucky if a nearby tree is producing fruit.
kakapo, Maud Island, New Zealand

Kakapo on Maud island, New Zealand. The world’s heaviest parrot, the extremely rare kakapo only breeds every three or four years when a particular tree species is fruiting. (© Chris Birmingham/Department of Conservation/Flickr Creative Commons)

“The kakapo is a nocturnal, flightless parrot residing in New Zealand. Males of this critically endangered species climb to the top of a mountain, build a nice round display area, then “boom” several hundred times per night to attract females. But the females are interested only once every three or four years when a particular tree species fruits — so the males boom tens of thousands of times before they get any action. Reminds me of some guys I knew in high school.”

2. Large testicled-monkeys fight with sperm, not teeth.

infant muriqui, Brazil

This infant muriqui in Brazil was likely fathered by the most virile male to mate with its mother. (© Conservation International/photo by Russell A. Mittermeier)

“Muriquis, which live in Brazil’s Atlantic Forest, are the largest South American monkey — and they have the testicles to match. Male muriquis have the largest testicles of any primate relative to their size (they’re pretty big in absolute terms as well). When a female is receptive, the males mate sequentially with her, with the one producing the most sperm presumably fathering the offspring. There is virtually no fighting among males; in fact, there’s great camaraderie.”

3. Thousands of snakes gather in Canada every year for a giant mixer.

“In the limestone caves around Lake Manitoba, geology has created perfect conditions for the annual mating season of red-sided garter snakes. As the males search among the hordes for females, they sometimes get tangled up in writhing balls of reptile.”

4. Female ring-tailed lemurs call the shots.

ring-tailed lemurs, Madagascar

Ring-tailed lemurs in Madagascar. (© Art Wolfe/

“In the society of Madagascar’s ring-tailed lemurs, females are dominant. Not only do the females beat the hell out of the males, they also have a strong dominance hierarchy among themselves, with subordinate females suffering a great deal.”


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5. Tortoise dating credentials: round, nearby

Galapagos tortoises

Galapagos tortoises, which like most tortoises are not very picky about the objects of their affection. (© Island Conservation 2012/Flickr Creative Commons)

“Tortoises try to mate with anything vaguely in the shape of a tortoise — footballs, rocks, shoes, other species of tortoise. The sounds they make while doing it are also quite distinctive. (If you think you’ve never heard it, it might be time to re-watch ‘Jurassic Park.’)”

6. Even some so-called monogamous species “cheat.”

silvery gibbons, Java, indonesia

A pair of silvery gibbons on the Indonesian island of Java. (© Lukas Blazek)

“Gibbons are often cited by animal lovers as a rare mammal that forms monogamous pair bonds. However, even these individuals cheat like hell.”

7. Hoarding birds attract females with blue treasure.

“The bowerbirds of Australia and New Guinea are junk collectors. They collect large quantities of stuff of different categories, mostly shiny things like pieces of plastic or metal, seeds, shells, etc., and try to impress females with them. I must have been a bowerbird in another life.”

8. With orangutans, the “nerds” have the last laugh.

male orangutan in Borneo, Malaysia

A “flanged” male orangutan has a snack on Borneo, Malaysia. (© Trond Larsen)

“When they reach maturity, male orangutans develop fleshy cheek pads called flanges. These big flanged males are the football players of the orangutan world, and you think they would dominate all mating. But the wimpy unflanged males (read: computer nerds) sneak in every chance they get, and actually have comparable reproductive success to the big guys.”

Molly Bergen is the senior managing editor of Human Nature. To test your knowledge on animal love, take this quiz

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Further reading


  1. Dexter says

    Marami pa talagang mga hayop na hindi nadidiskubre o natutuklasan. Ang iba naman ay kakaiba ang itsura o bago sa paningin ng mga tao. Ang ating mundo ay hindi pa talaga nalilibot ng buong buo. Marami pang mga lugar na may mga kakaibang hayop ngunit hindi mapuntahan dahil sa panganib na nakasalalay. Ang mga hayop ay dapat nating pangalagaan at ang kanilang mga tirahan, patuloy parin nating tuklasan ang mga bagay sa mundo at huwag sirain ang kalikasan.

  2. Pingback: Climate change spells trouble for orangutans | Human Nature - Conservation International Blog

  3. Pingback: Animal love: 5 weird ways species get it on | Human Nature - Conservation International Blog

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