In the ponds and flooded areas, they're hoping for frogs, toads, newts, aquatic plants, damsel flies and dragonflies.
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After three weeks on the winding back roads of Puerto Rico, politely knocking on people's doors to ask if they could root around on their land for frogs, the researchers were relieved to find plentiful specimens.
Scientists with Conservation International on Monday announced the discovery of 10 new species in what's being referred to as a safe haven for frogs located in the west of the country on the border with Panama.
In percentage terms, the worst situation for frogs is the Caribbean, where more than 80 percent of species are threatened or extinct in the Dominican Republic, Cuba and Jamaica and more than 90 percent in Haiti, according to the International Union for the Conservation of Nature.
"For example, frogs and salamanders are very sensitive to environmental change, maybe because of the way their absorbent skin interacts with the environment, " Professor Edwards told BBC News Online.
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If you were lucky, like we were, you also got: some quality family time, the Four Questions read to you in Yiddish and dark chocolate-covered frogs and locusts for dessert, representing two of the 10 plagues that befell Egypt.
Night treks are a memorable way to experience the sounds of the jungle at their loudest, with frogs and cicadas competing for attention.
As I studied the mounds of various sizes of grasshoppers in the markets, though, I found myself with a question similar to the one that goes through my mind when I see someone in Chinatown reach into a barrel of live frogs and pull one out for inspection: What, exactly, does one look for in a grasshopper?
White's tree frogs must use all that mucus for something, but not as glue.
It has been suggested some frogs and even spiders are using stars for orientation.
Scientists have known for decades that organisms as diverse as insects, frogs, pigs and humans make natural protein-based antibiotics to ward off microbes.
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Among research efforts on the fungus is one by Lopez and Longo, who have been catching frogs in the forest, checking them for Bd and ticks, and then releasing them back into the night.
When these travel over water any small items of debris in their path, such as fish or frogs, may be picked up and carried for up to several miles.
The closing track on the album, for example, is a 31-minute field recording of spring peepers (frogs).
Family members, for instance, like to take the plagues theme literally by throwing toy frogs at one another and having bugs, lice and other fake creatures on the Seder table.
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He and his colleagues developed an iPad app enabling users to create their own jungle music, syncing the sounds of howling monkeys, frogs, rain, fish and streams into a rhythmic symphony, free for children and potential adult visitors to download as a window into Costa Rica's biodiversity.
In another demo, Apple's Roger Rosner showed off textbooks for the iPad that allow students to zoom in on pictures of cells, dissect digital frogs and make notes and highlights on the e-book pages.
Frogs, which breathe and process toxins through their skin, are considered a promising area for pharmaceutical research and a bio-indicator that can tell scientists about what's going on in the environment.
Frogs have been under siege around the world from a fungus called Batrachochytrium dendrobatidis, known for short as "Bd, " which has been known to be weakening and killing amphibians since the late 1990s though much about it remains under scientific study, Voyles said.
He'll also be donning his wetsuit for a live encounter with predatory pike which have been known to eat small water fowl as well as fish and frogs.
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