Format
A data frame with 43 observations on the following 2 variables.
- species
- a character vector
- count
- a
numeric vector
Source
Sauer, J.R., J.E. Hines, and J. Fallon. 2003. The North American
breeding bird survey, results and analysis 1966-2002. Version 2003.1. USGS
Patuxent Wildlife Research Center, Laurel, MD.