Researchers estimate whale body mass from aerial images.

It could be a throwback to a mechanism that induces ovulation during sex, researchers propose, but not everyone thinks the results can be extrapolated to people.

Research has repeatedly suggested that spending time in natural environments improves mental and physical well-being. Now, scientists are gathering the data needed to incorporate this phenomenon in health-care guidelines.

The birds also decrease their heart rate and chill their blood to maintain flight in hypoxic conditions.

Anti-doping agencies are tracking levels of various molecules in athletes’ blood and urine over time to increase their ability to detect drug misuse.

Researchers identify changes to a pain receptor and to an ion channel that appear to enable the rodents to colonize otherwise inhospitable burrows.

A newfound family of metabolites emits green light in response to the blue light of the deep ocean, causing certain sharks to glow.

The goldenrod gall midge, a type of fly, bears larvae that can jump through the air despite their lack of limbs.

The connectomes trace 385 neurons in the male worm and 302 neurons in the hermaphrodite worm.