Table 2. Body size and habitat niche breadth for 12 species of resident North American breeding birds.

Common Name	Number of land cover types used	ln (mass)
Wild turkey	9	9.31
Greater sage grouse	1	8.01
Greater prairie chicken	2	6.91
Gambel’s quail	3	5.30
Red-headed woodpecker	10	4.32
Red-bellied woodpecker	8	4.32
Fish crow	6	5.71
Carolina chickadee	1	2.49
Carolina wren	5	2.99
Bewick’s wren	7	2.43
Bachman’s sparrow	2	3.12
Tricolored blackbird	2	4.09

Trait data were obtained from online natural history databases.