Researchers have discovered new species of tarantulas that are so aggressive that the males have evolved record-length genitals to survive mating.
A recently published article studies the mutually beneficial ecological relationships and evolutionary adaptations of tarantulas. The study reveals that the infamous spiders are actually often on friendly terms with amphibians, reptiles, and even army ants, which are known to feed on spiders. The researchers suggest that the dense hair covering tarantulas may have in fact evolved as a defence mechanism against these predatory ants.