This YouTube video was produced by the American Bird Conservancy.
A bird that drinks blood? The aptly named Vampire Ground-Finch fills the bill — literally! Like other sanguivorous animals, including mosquitoes and leeches, this bird gets vital nourishment from blood. Although they may seem gruesome, the Vampire Ground-Finch’s taste for blood is actually a clever adaptation to its arid environment.
Researchers theorize that its blood-slurping behavior evolved from the Vampire Ground-Finch’s habit of cleaning parasites from the plumage of the larger seabirds, such as boobies, that nest on its home islands. Pecking at parasites with its long, sharp bill eventually led to piercing the larger seabird’s skin, drawing blood that the finch could utilize as food during dry seasons when its other fare became scarce. Groups of Vampire Ground-Finches will gather to drink from these open wounds, but surprisingly, their feeding does not appear to harm the larger birds.
The Vampire Ground-Finch was once considered a subspecies of the more widespread Sharp-beaked Ground-Finch, one of “Darwin’s finches.” It was recently recognized as a separate species due to genetic, morphological, and song differences. The two separate populations of Vampire Ground-Finch, on Wolf and Darwin Islands, may actually be distinct subspecies; investigation into their differences is ongoing.
Learn more about the Vampire-Ground Finch at https://abcbirds.org/bird/vampire-ground-finch/
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