Overview
Project Name
Ontario Breeding Bird Atlas
Access Level
By Request
Year started
2021
Year Ended
2025
Dataset
Ontario Breeding Bird Atlas (2021-2025): checklist data
About
Dataset summary
Ontario Breeding Bird Atlas (2021-2025). Includes general atlassing checklists, point count data and special surveys (e.g. Nocturnal Owls, Marsh Birds), and summary of the highest breeding evidence reported by square and year for all species. This project represents the third atlas in the province, with the goal to allow an evaluation of changes in population levels and distribution.
Season(s) and frequency
Breeding season, depending on the species.
Geographic area covered
Ontario
Primary species covered
All breeding bird species
Goals
The atlas represents an enormous coordinated effort by thousands birders who surveyed the province from Lake Erie to Hudson Bay. It summarizes the state of all Ontario breeding birds, including information on each species' biology and abundance. Special sections analyze changes in bird populations and distribution, indicating which species are most imperiled and which are thriving.
Methods
Sampling Design
https://www.birdsontario.org/instructions/
Field methods
https://www.birdsontario.org/instructions/
Partners
Ontario Ministry of Natural Resources and Forestry
Citation
Birds Canada, Ontario Ministry of Natural Resources and Forestry, Environment and Climate Change Canada, Ontario Field Ornithologists, and Ontario Nature. 2025. "Ontario Breeding Bird Atlas". Data accessed from NatureCounts, Birds Canada.
