So that the islands of Bermuda and Madeira have been stocked from the neighbouring continents with birds, which for long ages have there struggled together, and have become mutually co-adapted. Hence, when settled in their new homes, each kind will have been kept by the others to its proper place and habits, and will consequently have been but little liable to modification.
Era honetan, Bermuda eta Madeira irlak inguruko kontinenteetako hegaztiez hornitu dira, hegaztiok, aspaldi-aspalditik, irlotan beren artean borrokatu dutelarik eta elkarri moldatzera iritsi direlarik. Horregatik beren herri berrian bizitzen jartzean, beste txoriek zegokion toki eta azturetan bizitzera behartuko zuten espezie horietako bakoitza, eta, beraz, ez zuten eraldaketa askorik izateko modurik izanen.