Patuxent Wildlife Research Center (PWRC)    Migratory Bird Research (MBR)    Comments/FAQ(comments)

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