1. Polygyny and nest predation in the rock pipit. Do females trade male assistance against safety?;Askenmo,1990
2. Time budgets of breeding mallard in northern Sweden;Asplund;Wildfowl,1981
3. Foraging time in herbivores: time per prey and day, so the plants may prey;Åström,1990
4. Sperm competition in birds;Birkhead;Trends Ecol. Evol.,1987
5. Sexual differences in reproductive effort: time-activity budgets of monogamous killdeer, Charadrius vociferus;Brunton;Anim. Behav.,1988