eaglesPA.RdA dataset containing the number of nesting pairs of eagles found in Pennsylvania, USA, from 1980 through 2015. Data is not available for all years and is given as NA.
eaglesPA
    A data frame with 2 columns:
Year of data collection, beginning in 1980
Number of breeding pairs of eagles (male plus female)
https://www.fws.gov/midwest/eagle/population/nos_state_tbl.html
http://www.media.pa.gov/pages/Game-Commission-Details.aspx?newsid=44
Pennsyulvania Game Commission. ND. Bald Eagle: Haliaeetus leucocephalus. http://www.pgc.pa.gov/Wildlife/EndangeredandThreatened/Pages/BaldEagle.aspx