...There is a decided variation in the length oftime required for the completion of the cycle from egg tobutterfly... 
Clarence M. Weed 「Butterflies Worth Knowing」
...When one has firmly fixed in mind the life cycle of one ofthese butterflies, one has a model after which to fashion therest, for our several species are remarkably alike in thisrespect...
Clarence M. Weed 「Butterflies Worth Knowing」
...A complete cycle was recorded in ten instances in a period of 19 to 23 days and in two instances in 32 days...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...One cottonmouth was examined periodically over a 34-day period by Allen and Swindell (1948:12), but a complete fang-shedding cycle was not observed...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Fitch (1956:463) found that copperheads in northeastern Kansas begin their annual cycle of activity in the latter part of April, when the daily maximum temperature is about 22° C...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
... At times in the fang-shedding cycle three and even four fangs can be in operation simultaneously...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...All these buds whenmature, whether free or fixed, lay eggs in their turn, from which a freshstock arises to renew this singular cycle of growth, known amongnaturalists as "alternate generations...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...The annual reproductive cycle of the California gull...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...Then come the short but pleasant days of autumn, the retreat undergroundand the winter torpor, the awakening of spring, and finally the cycle isclosed by the festival of pellet-making...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...The Anthrax cycle is thus divided into four periods, each of which corresponds with special forms and functions...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
...Notwithstanding the albuminous regimen, the cycle of the evolution is achieved without impediment...
J. Henri Fabre 「More Hunting Wasps」
...Thus ends the cycle of the year for the Cylindrical Halictus...
J. Henri Fabre 「Bramble-bees and Others」
...In most instances theorifice was not indicative of actual oestrus, as it persisted throughthe preceding and following stages of an oestrus cycle...
Henry S. Fitch 「Ecological Observations on the Woodrat, Neotoma floridana」
...A correspondent, writing to me from one of thecolleges, suggests that our spring really begins inDecember, because the "annual cycle of vegetablelife" seems to start then...
John Burroughs 「Ways of Nature」
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