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Like many other Spiders, the jaw parts of black widow spiders are too small and delicate to chew up their prey. So these spiders pump digestive juices into the bodies of their prey. After a while, the digestive fluids will have liquified all the digestible content inside the prey's exoskelaton, and then the spider sucks the fluid back into its own body.

Some other kinds of spiders have more robust chelicerae (the parts that are terminated by the fangs), and they have tooth-like protrusions on them. These spiders use their chelicerae to chew up the bodies of prey, adding digestive juices in the process, and so they are able to get nutrition from parts of the prey bodies that black widows can't get at.

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12y ago

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