Budgerigar
Melopsittacus undulatus
This common cagebird is often seen as an escaped singleton in a flock of House Sparrows but they are small birds and much more vulnerable to cold than their bigger cousins. Deliberate attempts to establish free-flying breeding colonies have all, so far failed — even on the Scillies.
From The State of the Nations Birds
Copyright © 2000 by Chris Mead