...These animals are very prolific, bringing forth from six to nine at a birth and three litters in a season... 
Elmer Harry Kreps 「Science of Trapping」
...According to Fitch (1960:134), litters of young copperheads usually shed within three to ten days after birth; but under unusually dry conditions shedding did not occur for several weeks...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...They associate with other young of the same litter and neighboring litters, and frequently frolic together...
Donald W. Janes 「Home Range and Movements of the Eastern Cottontail in Kansas」
...Theyconveyed their two litters of puppies to one place, and while one ofthe mothers remained to suckle and take care of them, the other wentinto Mr...
Edward Jesse 「Anecdotes of Dogs」
...104) says he can personally vouch for the influence of the male parent of the first litter on the subsequent litters by other fathers...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...These creatureshave litters that are much stronger and healthier than those which aremore tenderly guarded...
Dinks, Mayhew, and Hutchinson 「The Dog」
...In one yearthey should produce about 90 young and the youngfemales of the first one or two litters should be producingbefore the end of the year...
A. C. Smith 「The Raising and Care of Guinea Pigs」
...Loss of first litters ordinarily would be compensated for by theend of the season, since a female usually breeds more than once in thecourse of a season...
Henry S. Fitch 「Ecological Observations on the Woodrat, Neotoma floridana」
...The femalewoodrat's habit of dragging the young attached to her teats as she fleesfrom the house at any alarm must save many litters from predation by thepilot black snake...
Henry S. Fitch 「Ecological Observations on the Woodrat, Neotoma floridana」
...It is obvious that the females which are successful inrearing their litters produce at least two litters annually, andprobably some produce three litters...
Henry S. Fitch 「Ecological Observations on the Woodrat, Neotoma floridana」
...The rigorous weather conditions then may have beeninjurious, not only to the newborn litters but to the females comprisingthe breeding stock...
Henry S. Fitch 「Ecological Observations on the Woodrat, Neotoma floridana」
...Two had empty pouches on May 19 and 20, but probablyhad successfully reared the litters of young which they had beencarrying when trapped in April...
Henry S. Fitch 「Ecology of the Opossum on a Natural Area in Northeastern Kansas」
...The number of active opossums in the region of the study reachesa peak in late summer and early fall, when second litters of younghave grown large enough to become independent...
Henry S. Fitch 「Ecology of the Opossum on a Natural Area in Northeastern Kansas」
...Nevertheless,solitary individuals and individuals from litters all reach essentially the samesize 50 days after birth...
Charles L. Douglas 「Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado」
...Pregnant and lactating females, and newly-weaned litters, were fedlaboratory chow throughout this experiment...
Charles L. Douglas 「Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado」
...—Food and Water Consumed by Young Mice in Litters, After Weaning...
Charles L. Douglas 「Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado」
...I have nodoubt there were a dozen litters of kittens on that two miles ofridge; but the cover was so dense that nothing smaller than a deercould be seen moving...
William J Long 「Wilderness Ways」
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