Quote:
from whatbird.com (http://identify.whatbird.com/obj/230/overview/Purple_Martin.aspx):
Overview
Purple Martin: Large, vocal swallow with glossy dark purple-blue body and forked tail. It is the largest North American swallow. Black bill, legs and feet. Stong, graceful flight, alternates a...
As someone who has lost full-sized chickens to hawks, YES, they will take them. Depends on the particular type of hawk you have. Cooper's and red-tailed will take out larger birds. May not be able to carry it off, but will eat it where caught.