Wǒmen zài hǎibiān kàndào le yī qún tíhú zài mìshí.
We saw a flock of pelicans foraging by the sea.
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鹈鹕 is one of those rare two-character bird names where both characters are fairly obscure. Both 鹈 and 鹕 contain the bird radical 鸟. If you see two characters with bird radicals together, it's almost certainly a specific bird species.