The Vampire Finch is one of the 15 species of finches in the Galapagos. Vampire finch gets its name from the bloodthirsty vampire bats. Their unusual blood-sucking trait has made them well-known around the world. A subspecies of the Darwin Island’s sharp-beaked ground finch, they differ from the latter only by their feeding behavior. They, along with other Galapagos finches, are collectively called “Darwin’s Finches” for showcasing the example of Charles Darwin’s theory of evolution by natural selection.
Size: A small sized bird weighing around 20 grams.
Fur/hair/coat: Primarily black to grayish black in color (both body and tail).
Beaks/Bills: Small conical, light orange, and pointed.
Feet: Thin, straight, light black feet.
Eyes: Tiny, glossy black eyes with gray border.
Sexual Dimorphism
The males are black, and are brighter, while females are dull grayish with brown streaks.
Lifespan/Longevity
They live for 5-10 years (average), depending on food availability, range, etc.
Vampire Finch Bird
Distribution & Habitat: Where do they Live
They are found around the equator in the Pacific Ocean, and are native to the Galapagos Islands, west of continental Ecuador, in the deciduous forests with open patches of low-growing vegetation of the Darwin, the Genovesa, and the Wolf Island.
Behavior
These birds are gregarious, and also forage and feed together from a common source, especially the blood from a victim. However, in places where different species share a common range, competition can get intense.
Reproduction and Nesting
Typically monogamous, they breed opportunistically choosing mates. During mating season, males guard their nesting territories. The nests are small, dome-shaped, and often built in bushes or cactus plants. Egg-laying is most profuse in abundant rainfall and sufficient food.
Vampire Finch Nesting
Life Cycle
The clutch size of the vampire finch is usually three. The eggs are incubated for about 12 days, until the juveniles hatch out. The nestlings are mostly fed with insects by their parents. Baby vampire finches take around 14-15 days to leave the nest.
Diet: Do they Suck Blood
As opposed to the popular notion, these birds do not thrive only on blood, with their primary food being seeds and insects. Like other finch species, they are voracious seed-eaters; however, only when there is a lavish supply. They also consume bird eggs and nectar. With a frequent scarcity of fresh water and seeds, they evolved with this distinguished blood-drinking behavior, using their sharp beaks to peck on the skins of other larger birds (mostly the Booby).
Vampire Finch Size
Sounds and Calls
Those living in the Wolf emits a lilting song, and those in Darwin usually buzz. Both also emit a common whistling call.
Vampire Finch Beak
Adaptations
They have developed a very sharp beak to pierce through the skins of their victims to suck blood easily.
Predators
They have no specific predators, except for the larger local birds, and a few introduced species of mammals.
Conservation Status
This is an endangered species. Confined to a small island, the population is declining rapidly. However, very recent studies have shown a relative stability in their present population.
Vampire Finch Images
Interesting Facts
Strangely enough, the Boobies don’t seem to resist the vampire finches from drinking their blood. This is probably because they eventually benefit the boobies by picking insects off their feathers, keeping them unaware of the parasitism.
The vampire finch has the largest and most pointed beak of all the members of Geospiza difficilis.
At times, these finches suck the blood of their own dead.
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