This causal loop diagram helps to show the recovery efforts of the fish and eagle population after the chemical DDT almost wiped out the eagle population. In 1782, there were approximately 100,000 eagles. By 1963, there was only 487 nesting pairs.
Predator-Prey Model of Lynx and Arctic Hare
In each cycle, the hare populations is reduced to extremely low numbers, yet recovers (while the lynx population remains sizeable at the lowest rabbit density)