as little as approximately one per cent of its daily calorie intake.

In contrast, species that engage in prolonged or elaborate displays expend considerable amounts of energy and run the risk of developing fatigue. To prepare and prevent such a risk, some animals may gain weight before a courtship period, only to lose the weight afterward. An example of this can be seen in the greater sage-grouse (Centrocercus urophasianus). During the peak of their breeding season, which lasts up to three