When a species, owing to highly favourable circumstances, increases inordinately in numbers in a small tract, epidemics-at least, this seems generally to occur with our game animals-often ensue; and here we have a limiting check independent of the struggle for life.
Espezie bat, zirkunstantziak alde dituelako, eskualde txiki batean neurriz gain gehitzen denean, izurriteak gertatzen dira maiz-gutxienez gure ehizien artean hauxe jazotzen dela dirudi-, eta hemen oztopo murriztaile bat daukagu biziaren aldeko borrokatik aparte.