Across 35 North American bird species, adult females had 12.4% lower survival than males on average. The gap was strongest in long-distance migrants, but no clear explanation emerged. doi.org/hcc5sd
Female birds have shorter lifespans than male birds across 35 North American species, researchers find
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.
phys.org
