Inside Science
/
Article

Beefy Jaws May Help Some Spiders Gather Water

FEB 23, 2022
The mega-mawed spider appeared to use the water to reconstitute dried-up food.
Beefy Jaws May Help Some Spiders Gather Water lead image

Spider species in the group known as long-jawed orb weavers can carry water drops in their mouths.

Young Swee Ming via Shutterstock

(Inside Science) -- In the wetlands of Australia, a cheeky spider may have found a way to slurp up extra snacks. Last month in the journal Ethology, researchers reported an instance in which a long-jawed spider in the genus Tetragnatha used its gangly mouthparts to scoop up water and possibly rehydrate its dead, shriveled prey with it, according to author John Gould, a biologist at the University of Newcastle in Australia.

Gould was on a night field trip on Australia’s Kooragang Island, looking for threatened frogs, when he came across a long-jawed orb weaver in its web. He watched the spider descend on a bungee cord of silk to the surface of the pond below. Fetching a water drop between its jaws, the spider zoomed back up its lifeline and deposited the water onto its silk-wrapped prey.

As their name implies, Tetragnatha have ample jaws that they use for feeding and in mating rituals. The supersized mouthparts enabled the spider to carry its liquid cargo across its web, “almost like carrying water on a plate,” Gould wrote in an email.

He speculates the spider was rehydrating the withered prey carcass to extract more juice from it -- like a packet of dehydrated arachnid backpacking food. This may be a new behavior for spiders, which have been known to gather water from dew drops, but not directly from a water source.

More Science News
AAS
/
Article
In May 2024, the Sun put on a powerful display of solar storms, and researchers have examined the source of all this activity to understand why.
AAS
/
Article
The House and Senate bill drafts keep NASA near current funding levels, but the Trump administration is prematurely readying the agency for heavy cuts
FYI
/
Article
Top appropriators in both parties have signaled disagreement with Trump’s proposals for deep cuts and indirect cost caps.