Major irruptions have taken place in 1951–53, 1969–70, 1976–77, and 1993–95. Eventually dry conditions lead to a fall in rodent numbers and dispersal of birds, which often starve if they fail to find prey elsewhere.
Major irruptions have happened in 1951–53, 1969–70, 1976–77, and 1993–95. Dry conditions typically result in a decline of rodent populations and the dispersion of birds, which can lead to starvation if they cannot find food elsewhere.