Archaeopteryx was an evolutionary link between non-avian dinosaurs and birds.
Between verbal jokes, slapstick comedy and tickling, there are numerous reasons we laugh. But are humans the only species with a sense of humor?
Little is known about the mating behaviors of arctic-loving narwhals, also called the unicorns of the sea.
The cringe-worthy sexual behaviors of bed bugs involve traumatic insemination, no courtship activities and, sometimes, incest.
Hummingbird mating involves using specialized courtship rituals, tail feathers that sing, and weaponized beaks.
Chicken mating involves tidbitting, wing-flapping, a male waltz and the possibility of the female ejecting the male's sperm.
Though nine-banded armadillos are solitary creatures, they do occasionally get together for some genital sniffing, tail wagging and clucking in order to have sex.
Male dark fishing spiders spontaneously die after sex — but their nutritious bodies provide fuel for their mates to have more offspring that are larger and healthier.
Mating in these strange-looking mollusks lasts for 2 to 3 hours, but it's unclear what exactly is going on during this time.
Scorpion sex usually involves peaceful dancing, but sometimes can also include stinging and cannibalism.