Adelie penguins target jellyfish with prominent sex organs for a tasty meal, research from Antarctic "penguin cams" suggests.

Footage shows the penguins occasionally feeding on jellyfish with visible sex glands, even when their preferred food of small shrimp-like crustaceans known as krill are available, the study backed by conservation charity WWF found.

The findings, revealed in a new publication by scientists from the French and Japanese national Antarctic programmes, come from research conducted by fitting penguins with tiny cameras to see what they got up to under the sea ice.