From National Geographic:
"...a few penguins started to develop calluses on their feet that could have led to infections. Such calluses are common for penguins in captivity, because the seabirds, which normally spend most of their time fishing at sea, occasionally get lazy and spend too much time waddling on land."
"Elvis," a Blue penguin gets his new shoes checked from Penguin minder Bob Morgan at the International Antarctic Centre in Christchurch, New Zealand, Thursday, Nov. 9, 2006. The innovative shoe has been designed to fit over the feet of Little Blue penguins to keep them dry and free from infection after suffering problems when they moved to a new exhibit. (AP Photo/NZPA, John McCombe)
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