A GIFT FOR YOU Male nursery web spiders (left) present nuptial gifts in the form of insect carcasses wrapped in silk
PREMAPHOTOS/Nature Picture Library
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.
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.