Harold Francis Greeney III (born 1972) is an American biologist best known for establishing the Yanayacu Biological Research Station and Center for Creative Studies on the eastern slopes of Antisana volcano in Ecuador.
He is an author on over 225 peer-reviewed biological research articles concerning the ecology, behavior, and evolution of invertebrate and vertebrate species.
[1] Greeney's work on the reproductive biology of neotropical birds resulted in a Pamela and Alexander F. Skutch Research Award by the Association of Field Ornithologists in 2005.
Although he has published information on the nesting behavior of more than 500 species of birds, Greeney is well known for his interest in antpittas.
His passion and skill for finding bird nests, especially of rare or difficult to find species, have led to Greeney's participation in several nature documentaries such as Hummingbirds: Magic in the Air, An Original DUCKumentary, and Hummingbirds: Jewelled Messengers, as either a scientific consultant or in an on-air role.