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Crotophaga sulcirostris (groove-billed ani)
This unusual vocalization was made by a single Groove-billed Ani (Crotophaga sulcirostris) in Monteverde (Costa Rica) - Jim Zook, an accomplished ear-birder in Costa Rica says that he has also heard this call from the species.
Douglas Von Gausig (recordist; copyright holder), Naturesongs.com
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