The predator plague cycle shows how the beech mast increases predator numbers and how predators turn to birds for food.


Heavy seeding in our native forests in 2016 will again drive higher than normal rodent and stoat numbers that will prey on endangered birds. ‘Battle for our Birds’ will protect our native wildlife from predators.

Predator plague cycle.

View a larger version of this infographic in Battle for our Birds brochure (PDF, 3,713K).

What the predator plague cycle diagram shows:

  • Summer: When beech seed flowers heavily, much seed is produced.
  • Autumn: When seed is abundant, the rodent population increases rapidly.
  • Winter: Stoats feed on abundant rodents.
  • Spring: When the seed rots or germinates, plagues of rats turn to bird eggs and nestlings.
  • Summer onwards: Stoat numbers explode and they also turn to birds for food.
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