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Birds have a lot to do in their short lives: defend territories, build nests, raise chicks and feed themselves. But the toll of these activities may be greater for female birds than for male birds. A new study by UCLA ornithologists has found that female birds have lower survival

Most of us would like to hang around on the planet for as long as possible, and thankfully, lifespans in many countries are increasing. Scientists are also developing a new field known as longevity medicine, which aims to help people stay healthier for longer as they age.

Biologists group animals with similar traits into broad categories called orders. Despite their similarities, animal species in the same order can have very different average lifespans.