Duration of ‘peeks’ in ducks: how much time do Common Pochards Aythya ferina spend with an eye open while in a sleeping posture?

Figures & data

Figure 1. Peek duration for apparently sleeping Common Pochards in relation to the number of nearby neighbours.

Table 1. Estimated regression parameters for predictors included in a mixed effect model with peek duration as the dependent variable and individual duck identity as a random effect.

Predictors	d.f.	t-value	P
Nearest neighbour distance	55	1.671	0.100
Number of nearby neighbours	55	2.154	0.036
Neighbour distance * Neighbours number	55	−0.175	0.245
Number of sleeping neighbours	55	−0.396	0.694
Flock size	55	−0.035	0.972

Figure 2. Frequency distribution of peek durations for apparently sleeping Common Pochards.