Flying squirrels may have originated earlier than previously thought and remained unchanged for almost 12 million years.

In wild bonobos, sibling birth induced a sudden increase in urinary cortisol levels in the older offspring, a physiological response that occurred in all subjects and was independent of their age.

Regulatory sequences downstream of a key limb identity gene are required for normal sizes of leg bones, and are changed in wild species with dramatic alterations in pelvic structures.

Resetting a young gut microbiota in middle-aged individuals extends life span and slows aging in the naturally short-lived turquoise killifish, a new vertebrate model organism to study how the microbiota affects the aging process.

Analysis of naturally infected mosquitoes shows that ecosystem disturbance can lead to a turnover in host community composition and that more individuals of a single species are a key driver of virus emergence.

Little Swifts dynamically adjust their foraging behavior to aerial insect abundance, revealing key insights into predator–prey interactions and optimal foraging strategies in aerial environments.