TY - RPRT TI - Heightened exposure to parasites favors the evolution of immunity in brood parasitic cowbirds AU - Caldwell Hahn AU - William K. Reisen PY - 2011 DO - 10.1007/s11692-011-9112-0 UR - https://pubs.usgs.gov/publication/70004541 ID - 70004541 ER -