Captive bred pigeons can lay a new batch of eggs every month, but their feral cousins typically produce between two and four broods a year. While pigeons can lay their eggs at any time of year, they are more likely to nest during the spring and summer months, when the weather is warmer.
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.ystagmus is an involuntary condition in which the eyes make rapid, repeated, uncontrolled movements.
Nystagmus may be optokinetic (eye related) or vestibular (inner-ear related), and it can be either congenital (present at birth) or acquired due to injury or disease. In most cases it appears during infancy or childhood, but it can develop in adulthood. Nystagmus can be caused by: 1  Abnormal function in the part of the brain that controls your eye movements. 2  A problem with the neural pathway between the eye and brain.  A problem affecting the labyrinth (the part of the inner ear that senses movement and position)