New Zealand introduced trout eat introduced mice

This video says about itself:

Huge Trout Eats Mice – Wild New Zealand – BBC Earth

19 June 2017

With little competition and few predators, the Brown Trout in New Zealand has been known to grow to epic proportions. These prize fish sometimes reaching a metre in length and weighing up to 5 kilos have developed monstrous appetites and a bloodthirsty penchant for mice.