Record Holders | Animals Do It Too

Barnacles have penises up to 8 times their body length — the longest ratio of any animal on Earth.

Blue whales have the largest penis of any animal — up to 10 feet long and weighing around 400 pounds.

The Argentine lake duck has the longest penis relative to body size of any bird — up to 17 inches, longer than the duck itself.

Harp seal milk is about 50% fat — the fattiest of any mammal — allowing pups to gain 5 pounds per day and be weaned in just 12 days.

Female blanket octopuses are 40,000 times heavier than males — the most extreme size difference of any non-microscopic animal.

Male mosquitofish can complete mating in under one second — among the fastest sex acts in the animal kingdom.

Some stick insects remain coupled during mating for up to 10 weeks — among the longest mating sessions of any animal.

Male antechinus mate so intensively — up to 14 hours at a time — that every single male dies within weeks of the mating season.

Female elephants have the longest reproductive tracts of any land mammal — up to 12 feet from vulva to ovary.

9 Facts