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

	Species Richness Map	Trend Map	Summary of Geographic Pattern
All Species	X	X	X
Breeding Habitat
Grassland Birds	X	X	X
Wetland Birds	X	X	X
Scrub/successional Birds	X	X	X
Woodland Birds	X	X	X
Urban Birds	X	X	X
Nest Type
Cavity-Nesting Birds	X	X	X
Open-cup Nesting Birds	X	X	X
Migration Form
Short-distance Migrant Birds	X	X	X
Permanent Resident Birds	X	X	X
Neotropical Migrant Birds	X	X	X
Nest location
Ground and Low Nesting Birds	X	X	X
Mid-story and Canopy Nesting Birds	X	X	X