Although frogs were not marked, we believe all observed frogs were different individuals because of the density of frogs, the
reported territoriality of male cricket frogs (Wagner, 1989b), and our movement about the perimeter of the pond.
Urea accrued in liver during freezing of winter frogs, the
concentration reaching 157 [+ or -] 10 [micro]mol[g.sup.-1] fresh tissue, substantially higher ([F.sub.2,16] = 9.5, P = 0.002) than that found in unfrozen frogs, 114 [+ or -] 6 [micro]mol [g.sup.-1] fresh tissue, but returned to the reference level after thawing (Figure 3).
Assessing suitability of sites to re-establish frogs, the
team rediscovered the rare mountain yellow-legged frog in the San Jacinto Wilderness near Idyllwild, California.
The Nippon writer describes how at meals times the snakes, the frogs, the
dogs and nine tabby cats with no tails to speak of are to be seen in the garden all on the best of terms with each other ...
* In addition to frogs, the
parasite Ribeeirovia ondatrae has also caused deformities in amphibian cousins such as toads and salamanders.
Although terrestrial overwintering is common among toads and the five freeze-tolerant frogs, the
majority of frogs employ a different strategy.
Among these frogs, the
feed eggs aren't fertilized, but tadpoles of another Central American dart-poison frog, Osteocephaus oophagus, do eat fertilized eggs.
During the next few months, seven adult females -- including six previously observed to lay eggs -- developed functioning testicular nodules and aggressive behavior typical of male frogs, the
researchers report in the current issue of COPEIA, released in January.
Reptiles, birds and amphibians, however, generally do not hear sounds above 10,000 hertz, and for many of these creatures, including coqui frogs, the
distance between the ears is too small to localize sound the mammalian way.
After five years of experimenting to create the perfect amorous atmosphere for their blue poison arrow frogs, scientists at the National Aquarium in Baltimore have something to celebrate: six newly metamorphosed blue frogs, the
first bred in the United States.