7 Animals with the Weirdest Genitalia on Earth

The subject of human and animal sexuality has always been personally fascinating. What nature does to compensate adversarial blockades in order to multiply is astounding.

7. Bush Crickets (katydids)

Imagine if a 200 pound man had testicles that weighed 28 pounds – and that was normal. Well, that is the case with bush crickets. Their testicles are 14% of their body weight!

Common in American and Australia, bush crickets can also be found in fewer numbers around the globe. Interestingly, the testicles widely vary in texture. They can be very spiky or prickly to very smooth. Perhaps this has to do with the variation of the female bush crickets’ female organs, who knows.

SEE IMAGE of bush cricket’s testicles.

Unfortunately, this does not mean they have a large output of semen. Contrarily, they have a rather tiny amount of “ammunition”. The unusual size of the testicles has more to do with stamina. This is because male bush crickets have to endure very promiscuous partners. The female is known to mate as much as 23 times before she is satisfied with the outcomes.

Image: Joe Mabel

6. Carabid Beetles

These beetles don’t follow the law of nature in regards to symmetry. They only have one testicle. This doesn’t seem to affect their breeding capabilities whatsoever. In fact, these types of beetles give more than just semen to their partner. Their accessory glands produce the semen before it goes into the testicle. The accessory glands have rich nourishment for the fertilized eggs, promoting their well-being and survival.

IMAGE of abnormal beetle (on left) with two testicles and normal beetle (on right) with one testicle.

For reasons that researchers can’t explain yet, the left testicle is the one that is almost always missing. One thing researchers do know is that the accessory glands make for a tight squeeze in the already cramped abdominal cavity. Therefore, another testicle would likely seem redundant.


Image: J.N Stuart

5. Western Harvest Mice

The harvest mouse has the longest recorded penis in all of the animal kingdom. This is relative to the size of the animal, of course.

It is hard to imagine that the cute animal above, at a mere 17 cm long, has an 8 cm penis. The male harvest mouse must have a formidable penis length. Otherwise, he will not be allowed to mate with a female. The female ultimately decides who her partner will be depending on penis size.

Image: spacepleb


4. Ducks

The female is in charge in this species as well. The female will contort her female organs at will to make it impossible for the male to mate with her. To counteract this unyielding barrier, the male must make his penis as big, as thick, and as oddly shaped as possible to achieve success in mating.

To read more about the morphology of ducks, CLICK HERE.

3. Fruit Flies (drosophila bifurca)

Once having the largest testicles recorded, but now snubbed by the bush cricket, the fruit fly still holds the record for longest sperm cells (in relation to body size). It is amazing that this annoying, tiny fly that pesters humans and animals alike can carry this record out of the entire animal kingdom. Its sperm cells are 5.8 cm long. They are under a great deal of performance pressure because the fruit fly only makes a few hundred sperm cells in his entire lifetime.


2. Polar Bears

This is a particularly sad fact: The polar bear’s genitals are shrinking because of pollution. Because their food, like seals and other marine life, are exposed to chemicals like chlorine and industrial pollution, polar bears ingest these chemicals. The chemicals act like hormones when broken down in their systems.

Normally, male polar bears’ testicles are three inches wide and their penis bones are seven inches long. They are now significantly shrinking as pollution continues to increase in volume.

Polar bears are notoriously under-sexed and have low reproductive rates to begin with. Now, with undersized testicles and penises, with growing evidence that ovaries are also shrinking, the polar bear population will inevitably wither away.