1 Normally flickers lay 6 or 7 eggs.  Cowbirds (which parasitize the nests of other birds) usually lay about six eggs (one each day) in different nests, wait a few days, and then start again. They may lay more than 11-20 eggs per season. A captive female was recording laying 77 eggs, 67 of those in a continuous sequence.
What is nystagmus? Nystagmus is an involuntary condition in which the eyes make rapid, repeated, uncontrolled movements. These eye movements may be in any direction including horizontally, vertically, or rotationally (in a circle). Many people with nystagmus do not experience visual symptoms.
Background. Congenital or infantile nystagmus is a clinical sign that may take many different forms. Involuntary, rhythmic eye movements are characteristic, as they are in acquired nystagmus. Waveform, amplitude, and frequency can vary with changes in focal distance, direction of gaze, and under monocular or binocular viewing conditions.