Kittiwake chick (IMAGE)
Caption
Once a kittiwake chick hatches, the parents have to forage to feed their offspring, sometimes flying as far as 250 km in a day. In the process they lose 10% of their body weight, mostly by losing fat, and increase their breast muscle size. New research suggests that, in the process, they may also be improving their muscle structure.
Credit
IMAGE CREDIT: Kristen Lalla
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