Leucism is a condition caused by a genetic mutation that results in the loss of all types of pigmentation—the affected areas can be either entirely white or a pale, washed out shade of the expected coloration.
We have observed six species of swallows at Fair Meadows: three of which nest here (Barn Swallow, Tree Swallow, Purple Martin). Of the other species (Cliff Swallow, Northern Rough-winged Swallow, Bank Swallow), we have seen the Bank Swallow only in late summer.