A small bird with a blue cap or crown on its head, such as a great tit or certain warbler species.
From 'blue' plus 'cap,' a descriptive compound referring to birds with blue-colored plumage on their head or crown area.
Many bluecap birds are winter visitors to gardens, and they're incredibly acrobatic feeders—you'll see them hanging upside down from branches and bird feeders, which is why some species are called 'acrobats of the avian world.'
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