...Whenever it is moonlight the nights are passed in singing and dancing, beating drums, blowing horns, and the population of whole villages thus congregate together... 
Samuel White Baker 「In the Heart of Africa」
...The presence of such a great multitude gave to each of its individuals afeeling of security and mutual support that is very generally found inanimals who congregate in great herds...
William T. Hornaday 「The Extermination of the American Bison」
...When pools of water begin to dry up toward the end of summer, cottonmouths often congregate and feed on dying fish...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Like most hylid frogs Smilisca is most readily collected and observed whenindividuals congregate for breeding...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
..."When the ground is coveredwith snow, they congregate about houses, and frequent cornyardsalong with other birds, retiring to the trees and hedges in thevicinity when alarmed...
Rev. C. A. Johns 「British Birds in their Haunts」
...In the month of January, if mild, but as a rule in February,Herons show a disposition to congregate, and soon after repair totheir old-established breeding-places, called Heronries...
Rev. C. A. Johns 「British Birds in their Haunts」
...Even upon our own shores their nestingplaces are often occupied by manyhundred pairs, whilst further norththey congregate in countless multitudes...
Various 「Birds Illustrated by Color Photography [June, 1897]」
...After this the flocks soon begin theirmigration to the lower hills and mountain openings,and congregate into immense roosts...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...They have no migrations likethe passenger pigeon once so plentiful in the easternstates, nor do they congregate in such immense flocks...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...On the freshwater ponds and overflows they congregate in greatnumbers during the winter months and a bag limit oftwenty is no uncommon thing...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...Minke whales are frequently found as single animals,pairs, or trios, though they may congregate in areas of foodconcentration in the northern seas during the spring andsummer...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
...Hensel verifies this observation, andtells us of having seen apes come from their shelter in the earlymorning and congregate for a musical concert...
Royal Dixon 「The Human Side of Animals」
...The square in which the pillar of the Immaculate Conception issituated, along with the surrounding streets, is called the "GhettoInglese," for here the English and Americans most do congregate...
Hugh Macmillan 「Roman Mosaics」
...The man plunged his hands into his pockets, and, with a gesture of the most profound contempt, walked away to that part of the mess-shed where the “Ring” congregate...
Marcus Clarke 「For the Term of His Natural Life」
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