How scientists discovered that animals are doctors, too12 CardsAn infected monarch mother uses toxic milkweed to medicate offspring that inherit her parasites, not herself.
Some ants chew injured nestmates' limbs off with their mandibles to stop infection spreading through the colony.
'Super' El Niño is coming. What should you expect?11 CardsGalapagos corals show ocean-temperature variability was 36% higher in the last 40 to 50 years than during the pre-industrial period.
Corals tossed onto beaches by waves or tsunamis can preserve month-by-month temperature records from the periods when they grew.
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