Black widows are known for cannibalizing their mates, but this doesn’t actually happen all the time.
Certain species of salticids (jumping spiders) can see into spectrums we humans cannot. A few have been shown to be able to see both UVA and UVB light.
There are some ingenious ways spiders use to capture prey. For instance, the ogre-faced spider weaves a net between its front legs and then dangles above places where prey are likely to pass through....
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