The black widow contributes to it's ecosystem in (mainly) the same way that most spider do: by consuming small insects, namely flies and mosquitoes. The black widow also help control pests that affect crops such as locusts, caterpillars, grasshoppers, etc.
The black widow can not be safely consumed by birds, since when the birds eat their venom glands they are poisoned. However, black widow Spiders are eaten by mud-dauber wasps.
Generally, in ecosystems where the black widow spider is not present another species of spider will be present to control the insect population. black widows have red dots on their belly.just a fun little fact. i'm sorry if anything is spelld rong i am just 8.
(Elsa)
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