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Noun	1.	spring frog - similar to bullfrog; found in or near marshes and ponds; of United States and Canada green frog, Rana clamitans genus Rana, Rana - type genus of the Ranidae ranid, true frog - insectivorous usually semiaquatic web-footed amphibian with smooth moist skin and long hind legs
	2.	spring frog - common North American green or brownish frog having white-edged dark oval spots leopard frog, Rana pipiens genus Rana, Rana - type genus of the Ranidae ranid, true frog - insectivorous usually semiaquatic web-footed amphibian with smooth moist skin and long hind legs

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In addition to the winter bird counting, the book provides instructions for spring frog call counting, summer ladybug counting and fall Monarch butterfly tagging.

Winging it; Local author touts value of backyard research in `Citizen Scientists'

Because the hepatic glycogen store is substantially reduced following hibernation and mating, spring frogs can accrue only modest amounts of these agents, and this difference purportedly is the cause of their reduced freeze tolerance [4-8].

Winter and spring frogs were frozen slowly and thawed gradually following a protocol that promotes survival by facilitating cryoprotective responses and presumably mimics natural freezing and thawing episodes (i.e., slow freezing followed by gradual warming).

We could not assay urea in the plasma of spring frogs that were frozen or frozen/thawed, as too little sample was available.

We examined freeze tolerance in spring frogs by subjecting them to experimental freezing and thawing as described in the preceding section, except that these frogs (n = 6 per group) were cooled to the prescribed [T.sub.b], -5[degrees]C, -7.5[degrees]C, or -10[degrees]C, over a period of 80, 130, and 180 h, respectively.

Morphometric and physiological variables were compared between winter and spring frogs using Student's 1-tests.

Spring frogs weighed ~55% more and were 14% longer than winter frogs (Table 1).

There was congruence between winter and spring frogs in several of the response variables (Table 1).

Frogs of the two groups had similar glycemic levels, but winter frogs had plasma urea levels almost 100 [micro]mol[mL.sup.-1] higher than those in spring frogs. Due in part to the abundance of this solute, winter frogs had a markedly higher (2.24-fold) plasma osmolality (Table 1).

Observations made during tissue harvesting attested that spring frogs sampled 48 h after freezing began contained substantial amounts of ice in the coelom, beneath the skin, and within the muscles.

This was also the case with spring frogs ([F.sub.2,13] = 66.9, P < 0.0001), although the pattern of change differed between the groups ([F.sub.5,29] = 59.0, P < 0.0001).

Seasonality of freeze tolerance in a subarctic population of the wood frog, Rana sylvatica