Most animals reach an adult size, then spend the rest of their lives maintaining it. After maturity, their energy goes toward ...

Find out which animals live the longest and what clues this gives us for potentially slowing down human aging.

For some animals, reproduction comes at the ultimate cost—their own lives. While this may seem extreme, it's a natural strategy to maximize reproductive success. These species invest everything into ...

In the animal kingdom, mating isn’t always about survival. From praying mantises to octopuses, some species die during or ...

The energy invested in animal reproduction is as much as 10 times greater than previously estimated when the metabolic load of bearing and caring for offspring is accounted for, according to a new ...