Their eggs cannot be distinguished from those of the cliff swallow.
They have also been known to use the deserted homes of the cliff swallow.
Much the same pattern of weight increase was noted by Stoner in the cliff swallow.
The eggs of the barn swallow and cliff swallow are more or less speckled.
Take the cliff swallow, for instance; it has largely left the cliffs for the eaves of our buildings.
My opportunity to study the ways of the cliff swallow (Petrochelidon lunifrons) has been very limited.
From the cliff swallow's eggs, they differ in having finer spots, and in being smaller and rather more elongated.
Like the cliff swallow, the tree swallow is fast losing the right to its name.