House Sparrow female and young, at nest box entrance
The House Sparrow is a highly adaptable species, and where it has been introduced often occupies nest boxes intended for native species. (Building nest boxes with small enough entrances [about 31 mm {1 1/4 in} diameter] prevents House Sparrows from using them, although certain native species too.) This female was feeding young in — somewhat ironically — the Inglewood Bird Sanctuary in Calgary, Alberta, Canada.
House Sparrow female and young, at nest box entrance
The House Sparrow is a highly adaptable species, and where it has been introduced often occupies nest boxes intended for native species. (Building nest boxes with small enough entrances [about 31 mm {1 1/4 in} diameter] prevents House Sparrows from using them, although certain native species too.) This female was feeding young in — somewhat ironically — the Inglewood Bird Sanctuary in Calgary, Alberta, Canada.