Chinstrap eggs are more rounded than other penguins’ eggs. They measure 7cm long and 5.5cm wide, but at maximum weigh in a bit lighter at around 120g – that’s about twice the size of a chicken egg.

These penguins found a way to gain the advantage of sleeping while also remaining vigilant to protect their eggs." Named after the thin black strip that runs under their beaks, chinstrap penguins ...

Scientists discovered the astonishing micro-napping habit while trying to understand how male chinstrap penguins appeared to ...