Seasonal patterns in abundance of Lilacbreasted Rollers Coracias caudata and Purple Rollers Coracias naevia inferred from roadside counts in eastern and northern Botswana
The relative abundance of rollers (Coraciidae) in 45, 933 km of roadside counts made in eastern and northern Botswana between May 1991 and April 1994 was assesedby season and biome.