Life & Evolution

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nursery web spiders

A GIFT FOR YOU  Male nursery web spiders (left) present nuptial gifts in the form of insect carcasses wrapped in silk

air bubbles in a rock

NOT-SO-FRESH AIR  Ancient air embedded inside rock salt for 815 million years suggests that oxygen was already abundant when the first animals appeared. The microscopic air bubbles were trapped inside rectangular inclusions (one circled in red) in the rock.

Cow killer ant

OUCH  Dasymutilla occidentalis, commonly known as the cow killer ant based on its painful sting, is actually a flightless wasp. The wasp and other venomous critters are the subjects of two new books.

Life & Evolution

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