- American Museum of Natural History: Passenger Pigeons
- Reports range, habitat, population counts, threats, and information on the exhibit.
- Chipper Woods Bird Observatory: Passenger Pigeon
- Presents images, general information, nesting behavior, conservation status, and citations.
- Encyclopedia Smithsonian: The Passenger Pigeon
- Gives history of relationship with humans, attempts to save the species, image of the last known individual, characteristics, related species, behavior, and conservation.
- The Extinction Website: Passenger Pigeon
- Features classification, other names, characteristics, lifestyle, range and habitat, food, reproduction, history, extinction causes, conservation attempts, and museum specimens.
- In Memoriam: The Passenger Pigeon
- Contains descriptions of behavior, appearance, and population numbers from different naturalists.
- The Passenger Pigeon
- Presents history and observations of numbers, behavior, and threats.
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