TY - JOUR A1 - Hatchwell, B.J. A1 - Komdeur, J. T1 - Ecological constraints, life history traits and the evolution of cooperative breeding Y1 - 2000 DO - 10.1006/anbe.2000.1394 JF - Animal Behaviour VL - 59 IS - 6 SP - 1079 EP - -1086 ER -