Condoms were originally made of animal intestines or linen.
347
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Dogs sometimes fake being sick to get attention.
26
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5
There's a competition in Sweden called Kaninhoppning, or rabbit show jumping.
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In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
9