Penguins Are the Only Birds that Molt

Molting is a biological process by shedding the old feathers, skin, hair, nails, and making way for new growth. Every animal and bird undergo molting, even humans. Especially, penguins experience rapid shedding of feathers, which acquire the whole body within a few weeks. Penguins molt at least once a year, some of them molt twice or thrice a year.