HI:
This is from The dictionary of American Bird Names by Ernest Choate:
Bullbat: "for its crepuscular habit which it shares with bats. Bull, for
its comparatively large size and noisy habit(courtship display?)."

--
Ian Paulsen
Bainbridge Island, WA, USA
A.K.A.: "Birdbooker"
"Rallidae all the way!"