Sentences with phrase «leopard frog»

And these young northern leopard frogs were hungry, too hungry for the wetlands to support in such numbers.

In the early 1950s, Robert Briggs and Thomas King repeated Spemann's experiments using a species of leopard frog, Rana pipiens, first with a nucleus from young embryos (Briggs and King, 1952) then from older embryos (King and Briggs, 1954); both the younger and older implanted nuclei could still be reprogrammed by the enucleated host cell.

Even so, nobody in 1952 should have been surprised to see abundant northern leopard frogs in Wisconsin or anywhere in much of the rest of the northern and western United States.

Final Decision (if proposed): Scarlet Hawaiian honeycreeper («i «iwi), relict leopard frog, Tahoe yellow cress.

University of Utah researchers used leopard frogs like the one shown here to measure tiny voltages from single brain cells and learn how those cells learn to detect short sounds.

These streams support abundant flora, including sycamores and cottonwoods, and fauna such as Chiricahua leopard frogs and sensitive Rio Grande cutthroat trout, which will be soon restored to the streams.

The rich habitat around Ladder Ranch allows at - risk species, such as leopard frogs and cutthroat trout, to survive and also helps healthy species thrive.

One spring six decades ago, in the ponds and marshes along a western arm of Lake Michigan, about 25 miles north of the city of Green Bay, Wis., the northern leopard frog Lithobates pipiens was busy breeding.

«Today, if we find a site with 30 breeding females, that's healthy,» says Lea Randall, a population ecologist and biologist who leads a northern leopard frog study program for the Center for Conservation Research at the Calgary Zoo.

During the 1970s and»80s, though, it wasn't dissection but the loss of habitat, disease and pollution that combined to greatly reduce the number of northern leopard frogs throughout their range.

Compared with other common frogs, people often found the northern leopard frogs handsome, intelligent - looking and even «aristocratic.»

Also, frog call frequencies fall within the range people hear, and the frequencies used by leopard frogs are those at which people can hear the quietest sounds, Rose says.

He then added Roundup to the water to achieve a concentration of 3.8 mg / L, the highest concentration likely to be found in nature.Within a day, Roundup completely eliminated leopard frog and grey tree frog tadpoles and nearly exterminated the wood frog tadpoles.

There are mail - order companies that sell «grow your own tadpole» kits that typically supply bullfrog or leopard frog tadpoles with the kit.

On the other hand, even a small adult leopard frog (Rana pipiens) will badly bruise itself in anything less than a 50 - gallon tank, and bull frogs (Rana catesbiana) should have something even larger.

It's 7 a.m., but Hayes has been here since 4:30 this morning, when he came to «make water» — mix the chemical cocktails in which he's raising 3,000 leopard frogs in a crowded basement lab.

Well organized and clearly written, this lively entry in the Scientists in the Field series introduces Tyrone Hayes, a biologist studying the effects of agricultural pesticides on the reproductive organs of leopard frogs.

In the early 1950s, Profs. Robert Briggs and Thomas King (at the Fox Chase Cancer Center, Philadelphia, Pennsylvania) repeated Spemann's experiments using leopard frogs and had success using a nucleus from an even later point in embryonic development.

In some areas of the U.S. and Canada, the population of northern leopard frogs is no longer in free - fall decline.

Ashley Hosmer, an intern supporting the research project, swabs a northern leopard frog to collect secreted hormones tested for stress levels.

Gradually, though, as the summer wore on, the leopard frogs retreated, and peace came back to the people of Oconto.

Tadpoles of northern leopard frogs were exposed to polybrominated diphenyl ethers in their food from the time they could swim until they turned into frogs.

Northern leopard frogs are found in the northern and western United States and southern Canada.

Now a study of the northern leopard frog (Rana pipiens), chosen partly for its handy size and wide availability, reveals how the frogs make their prodigious jumps despite relatively small muscles: They turn themselves into catapults.

Dietary exposure to low pesticide doses causes long - term immunosuppression in the leopard frog (Rana pipiens).

The leopard frog leaps from tadpole adolescence to four - legged adulthood thanks to thyroid hormone, making it a natural model for studying the thyroid - brain connection.

The leopard frog does not get as big, but it also has an incredible ability to leap and is one of our more toxic species.

Gray tree frogs, bird voice tree frogs, green tree frogs, leopard frogs and bull frogs are also common in the area and considered prey by many other predatory species.

A leopard frog catches a cricket using its sticky tongue.

A number of reptile and amphibian species occur in the area, including the sensitive boreal toad and northern leopard frog.

The northern leopard frog has a curious way of swallowing its meals: it temporarily contracts its eyeballs into its head to help push the prey down its throat.