temps (durée) (1) espèce (1) comportement (1) recherche (1) famille (1) exploration (1) évolution (1) demande (offre et demande) (1) adulte (1) Context (1) Variation (1) Care (1) Selection (1) Time (1) Species (1) Research (1) Perspective (1) Personality (1) Parents (1) Forecasting--Study and teaching (1) Families (1) Expression (1) Evolution (1) Brothers and sisters (1) Begging (1) Animals (1) Aggressiveness (1) Adaptations (1) Adaptations (1) Psychology (1)