What is the relation between hormones and bird migration?

In her PhD, Juliana da Costa Ara├║jo investigates whether hormones influence changes in the behavior of a South American bird throughout the seasons. High body temperature, feathers, oil and shivering: those are ways how birds living in cold climates manage to survive the winter. Their feathers help them conserve heat coming from their own bodies by keeping a layer of warm air between them. They … Continue reading What is the relation between hormones and bird migration?