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 occurred in 1951–53, 1969–70, 1976–77, and 1993–95. Eventually dry conditions result in a decrease in rodent populations and the dispersal of birds, which often starve if they cannot find food elsewhere.