The Big Picture: Large-scale Summary of
Population Change and Species Richness
for Species Groups
This part of the Home Page provides an overall summary and
discussion of large-scale patterns of bird species richness and
population change (since 1966) for groups of North American birds.
Description of Methods
Click here for a description of the methods and rationale for analysis
of species groups
Click here for a note about calculation of species richness
Species Group List
Click here to view species lists for each group
Analysis of Percentage of Species with Positive Trends
Click here to view histogram showing percentages by species groups
Maps and Summaries for each Group
All Species
Breeding Habitat
Grassland Birds
Wetland Birds
Scrub/successional Birds
Woodland Birds
Urban Birds
Nest Type
Cavity-Nesting Birds
Open-cup Nesting Birds
Migration Form
Short-distance Migrant Birds
Permanent Resident Birds
Neotropical Migrant Birds
Nest location
Ground and Low Nesting Birds
Mid-story and Canopy Nesting Birds