Four African penguins, who are a critically endangered species, hatched at Mystic Aquarium earlier this month.
The penguin chicks hatched in early January and they're the offspring of two first-time penguin parent pairs: purple/red and black/blue, and black/green and purple/green.
Mystic Aquarium doesn't name its penguins, and refers to them by the plastic-colored beads on their tags.
The chicks hatched on Jan. 6, 7, 9 and 10. The aquarium said the chicks have already shown remarkable growth.
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African penguins are a critically endangered species, meaning they face an extremely high risk of extinction, according to the aquarium.
They said the African penguin population has declined by 97%, with estimates suggesting they could disappear from the wild in the next decade.
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Mystic Aquarium said these penguins can grow to about 24 to 27 inches tall and weigh about eight to 10 pounds. They eat fish including anchovies, pilchards, sardines and more.
