Avian vampire flies (Philornis downsi) were not discovered in the Galápagos Islands for almost three decades after they were thought to have arrived from mainland Ecuador in the 1960s. Even then, the first were found by accident. Birgit Fessl, a landbird ecologist, was surveying for native species on the island of Santa Cruz in 1997 when she reached into the branches of a tree to take down the huge, domed nest of a woodpecker finch. Inside was a…
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