Penguin chicks fledge their nests to join adults by the pool
Health checks were carried out on the chicks to make sure they are growing as expected and do not have any health issues.
Penguins
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Meet Macadamia, Cashew, Peanut and Pistachio: Zoo welcomes four baby penguins
The chicks, who have all been named after nuts, arrived within a few days of each other.
'World's oldest' Humboldt penguin celebrates birthday
Rosie has lived at Sewerby Hall in East Yorkshire since 1990.