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The several western and extreme southwestern forms of the native House
Finch may, for our present purposes, be grouped with birds like the
Robin and Phoebe which find such a number and variety of chance but
suitable nesting sites that to provide still others may seem superfluous
effort. And yet, to see the bright red of the Common House Finch and to
hear his cheery song, say, in the heart of a city like Denver where one
looks only for English Sparrows, is to be tempted to offer this citizen
a more "desirable property" than the water-spout or other chance nook or
cranny in which he may otherwise elect to build. The most successful is
the open or semi-open type of nesting box, as shown in Plate VI, Nos. 1
and 2.