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#7 Chatterboxes Gentoo Penguins (Pygoscelis papua) on Danko Island on the Antarctic Peninsula in Antarctica. Image via Depositphotos Penguins are chatty birds and like to let others know how they feel ...

Satellite imagery has revealed a yet-to-be-explained rise in the Southern Ocean's salinity. It could be a key factor in the decline of the region's sea ice.

ABSTRACT Changes in the amounts and proportions of leukocytes, known as leucocyte profiles, have been documented for several bird species and have been used to measure stress levels in these animals.