Spider Diet: What Do Spiders Eat? - Science ABC

What Do Spiders Eat?

So, what do spiders like to eat? Thanks to Hollywood movies, many of us suffer from paranoia of getting bitten by a spider and dying some tragic death wrapped in a web. However, it’s important to note that humans are not a food source for these diminutive eight-legged creatures. With that being said, let’s now look into more detail about the preferred food choices of spiders.

The diet of a spider depends on its type. Web-building spiders like to feed on insects like flies, moths, mosquitoes, etc. Hunting spiders are a more voracious variety of spiders. They camouflage themselves and attack their prey when it’s in their proximity. They eat grasshoppers, beetles, crickets etc. Some giant hunter species like the huntsman spider are reported to even feed on lizards and frogs. It must be noted that most spiders like to feed on live prey or prey that has been killed or died recently. Stale prey is a big turn-off for these diminutive arachnids!

Curious Case Of Bagheera Kiplingi: A Plant-eating Spider

Spiders don’t usually dine on plants and cannot eat solid food directly. They need to liquify their food before ingesting it, and their digestive system is not designed to digest the cellulose of plants. Recently, however, a spider species called Bagheera kiplingi was discovered in Central America whose primary food source is plant material! This plant-eating spider species dwell on the Acacia tree and feeds on the nectar the tree provides. The digestive system of these spiders can process sugar, proteins and even some fats, but whether or not they can digest cellulose remains a matter of further investigation and studies.

Some spiders can be described as ‘fussy eaters’, as they are very selective and only confine their diet to a particular type of prey. For example, Lampona, a white-tailed spider, only prefers to eat other spiders. They rarely go beyond foraging for insects other than spiders. Lampona are sometimes even successful in trapping elusive long-legged spiders like Pholcus.

Kerengga Spider: Spider That Mimics Ants To Eat Ants!

Interestingly, many spiders in the Myrmachne genus, such as the Kerengga spider, deceptively mimic ants and prefer to feed on them once the right opportunity presents itself. They have adapted themselves to look very similar to an ant, which often gives them access to the foraging ant’s stream without alarming the colony. Ordgarius magnificus, commonly called the magnificent spider in Australia, uses a different means of disguise to prey on ants. They suspend a fluid droplet containing a powerful pheromone attractant that draws insects like ants and moths toward the droplet. When the poor prey fall for this droplet trick, the magnificent spider attacks and eats them.

Do Spiders Practice Cannibalism?

Although spiders are generally solitary creatures, if two disparate species move into close proximity, the more voracious of the two may cannibalize the other.

While female spiders do display usual maternal behavior towards their newly hatched spiderlings, it is not uncommon that a spider mother may also eat her newborns if there is an acute shortage of food. Not only mothers, but also siblings will eat their newborn kin in adverse circumstances.