TY - GEN AU - Bell,Alison M TI - Individual variation and the challenge hypothesis SN - 1095-6867 PY - 2021///0323 KW - Aggression KW - physiology KW - Animals KW - Behavior, Animal KW - Biological Variation, Individual KW - Hierarchy, Social KW - Sexual Behavior, Animal KW - Social Environment KW - Territoriality KW - Testosterone KW - metabolism N1 - Publication Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.; Review UR - https://doi.org/10.1016/j.yhbeh.2019.06.013 ER -