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We now know why tarantulas are hairy — to stop army ants eating them alive
However, the spiders still needed protection in case the ants got bitey. This hair-defense hypothesis is supported by previous studies that suggested burrowing tarantulas cover their egg sacs in ...
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Tarantulas Evolved To Have Dense Hair As A Defense Mechanism, Protecting Themselves Against Predatory Army Ants, According To A New Study
The spiders can also prevent ants from attacking their eggs by covering egg sacs with these hairs. So, species with thinner ...