Spiders

'Size really does matter' The males of four newfound tarantula species have extremely long genitalia so that they can keep their distance from aggressive females during mating, researchers say.

Footage from the BBC's new nature series "Parenthood" shows African social spiders committing matricide and cannibalizing their elderly relatives. Even Sir David Attenborough was horrified.

Social signals stop young labyrinth spiders from hunting their siblings even when they are starving. However, the cannibalistic spiderlings quickly feed on the corpses of their brothers and sisters.

The giant sea spiders can have leg spans of up to 20 inches (51 centimeters).

A new fungus that infects cave spiders and turns them into "zombies" was discovered in a Victorian gunpowder store at Castle Espie in Northern Ireland during filming for a TV show.

The Sydney funnel-web spider has extremely dangerous venom, but according to a new study this spider is actually three different species — one of which, the "Newcastle big boy," is much larger.

Hemsworth, a colossal funnel-web spider recently donated to the Australian Reptile Park, could make significant contributions to the park's life-saving venom-milking program, keepers say.

The newly discovered tarantula Trichopelma grande has unusually hairy legs for a ground-dwelling species. It's also much bigger than its relatives — and scientists aren't sure why.