- Groove-billed Ani (Crotophaga sulcirostris)
- US Geological Survey reviews size, appearance, social structure, habitat, life history, map, song, and taxonomy.
- USGS: Smooth-billed Ani (Crotophaga ani)
- Discusses plumage, characteristics, range, similar species, migration, diet, clutch size, and glossary.
- WhatBird.com: Groove-billed Ani (Crotophaga sulcirostris)
- Relates physical appearance, locations, sound clip, interesting facts, range map, characteristics, behavior, and drawing.
- WhatBird.com: Smooth-billed Ani (Crotophaga ani)
- Includes overview, range map, pictures, physical characteristics, breeding, nesting, feeding, and similar species.
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