title: Aggression, testosterone, and the spring decline in populations of the vole Microtus townsendii.
mesh_terms: D000374:Aggression / Q000187:drug effects; D000818:Animals; D003411:Arvicolinae / Q000469:parasitology*; D006801:Humans; D008297:Male; D011156:Population Density; D012377:Rodentia / Q000469:parasitology*; D012621:Seasons; D013739:Testosterone / Q000494:pharmacology*
chemical_list: D013739:Testosterone