Spiders

Brown widow spiders, which are invasive to North America, are wiping out black widow populations in the U.S. by aggressively attacking them for no clear reason, a new study shows.

Bites from brown recluse spiders can cause an autoimmune form of hemolytic anemia, in which red blood cells are destroyed by the immune system.

Spiders likely sleep and dream like humans do.

Researchers have turned dead wolf spiders into machine grippers that can be used to pick up a variety of objects, including other spiders, by blowing air into their lifeless corpses.

Male spiders that dance to their own beat are more likely to win mates compared to those that stick to a formula, new research finds.

Once mating is over, male orb-weavers catapult off the bodies of females to avoid being eaten, moving at a speed that's too fast to glimpse with the naked eye.

Pack hunting spiders use web vibrations to coordinate their attacks.

Invertebrate butts are both diverse and bizarre, and are being celebrated on Twitter in art, photos and video.

Before now, the species had never been seen catching bats.

Scientists discovered a new type of parasitic worm that only infects the mouths of tarantula spiders.

The Australian Reptile Park recently welcomed the biggest funnel-web spider that the keepers had ever seen.

Scientists have created an altered version of daddy longlegs with shortened and morphologically altered legs by suppressing the genes behind the development of their long legs.

Venomous spiders prey upon snakes many times their size, a new study finds — and often emerge victorious against snakes as venomous as they are.