Table 2. Description of each treatment. Light levels were manipulated by adding and removing a red filter atop the fluctuating nest.

Treatment	Procedure for every 10-min interval
1) 25% Good : 75% Poor	Dark for 2.5 min and bright for 7.5 min
2) 50% Good : 50% Poor	Dark for 5 min and bright for 5 min
3) 75% Good : 25% Poor	Dark for 7.5 min and bright for 2.5 min