A real bird mystery…

The following two swallows entered the same nesting box, but don’t seem to be of the same species. Does anyone have any suggestions as to why? One of them is very clearly a Tree Swallow.

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3 responses to “A real bird mystery…

  1. I should add that they were taken in Stanley Park, Vancouver, BC, Canada this afternoon (July 8).

  2. JoSanz1217

    Pierre…I believe the drab bird is the female Tree Swallow, and this one is very pale in color. There must be babies in the nest box, as she is removing a fecal sac, while the male is bringing food to them..

  3. Yes, after some more reflection, this does seem to be the most plausible explanation.