Scientists in Japan say they have discovered what makes some Antarctic penguins expert hunters.
They attached cameras and special sensors to the Adelie penguins to monitor their movement.
Experts say the birds adapted the way they hunted for different prey.
They found that when the penguins catch fish, they attack from underneath.
But when they hunt krill, which is like a small shrimp, they were more crafty.
The penguins swam upward then changed direction, darting their heads just before attacking their prey.