The baby greater flamingos, which are still only about 20cm in height, broke out of their shells a few days ago at the Wildfowl and Wetlands Trust (WWT) reserve at Slimbridge.
They are the first flamingo chicks to hatch at the reserve this year, but wardens are hoping for many more over the next four to six weeks.
The reserve is one of the leading havens in the UK for rare birds and has the country's largest population of greater flamingos.
Pink plumage
The new hatchlings have fluffy, soft grey down feathers and are distinctive among the bright pink plumage of the fully-grown birds.
Their feathers will not turn fully pink until they are two years old.
Jo Chambers, from the WWT at Slimbridge, said the first new flamingo chicks of the year traditionally attracted large crowds to the reserve.
She said: "They are very popular because they are so unusual - and they are such a contrast to the adults.
"There are lots of ducklings around at the moment, but seeing a flamingo chick is something people do not see very often."
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