A flock of small swallows now appears: they seem tailless and with white bellies.
"The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873" by David Livingstone
The birds that build these nests are small grey swallows, with bellies of a dirty white.
"Stories about the Instinct of Animals, Their Characters, and Habits" by Thomas Bingley
Swallow, barn, 23; white-bellied, 23, 228.
"Birds in the Bush" by Bradford Torrey
TREE SWALLOW; White-bellied Swallow.
"The Bird Book" by Chester A. Reed