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Frog watch: use a field journal. (Critical Thinking).

Reread Verb 1. reread - read anew; read again; "He re-read her letters to him"
read - interpret something that is written or printed; "read the advertisement"; "Have you read Salman Rushdie?"
 the article "Rainforest Frogs: Vanishing Act "Vanishing Act" is an episode of The Outer Limits television series. It first aired on 21 July, 1996, during the second season. Introduction
Trevor McPhee makes a quick trip to the shops, but after a strange experience he returns home to find that ten years have
?" (p. 12). Now, imagine you're a herpetologist her·pe·tol·o·gy  
The branch of zoology that deals with reptiles and amphibians.

[Greek herpeton, reptile (from herpein, to creep) + -logy.
. You are observing frogs in a tropical rainforest Tropical rainforests are rainforests generally found near the equator. They are common in Asia, Africa, South America, Central America, and on many of the Pacific Islands. , and you've noticed flogs doing strange things that leave you scratching your head in wonder. But that's okay! A scientist always starts with questions--not answers.

Below are notes from your field diary. Write an educated guess, or hypothesis, to explain each frog's adaptation, a change that helps the frog frog, common name for an amphibian of the order Anura. Frogs are found all over the world, except in Antarctica. They require moisture and usually live in quiet freshwater or in the woods.  survive in its environment. Of course, in real life, a field diary is just the beginning. Confirming your hypothesis could take years of field observation, data collection, and lab work.

Directions: Read the information below and hypothesize hy·poth·e·size  
v. hy·poth·e·sized, hy·poth·e·siz·ing, hy·poth·e·siz·es
To assert as a hypothesis.

To form a hypothesis.
 why each frog developed the trait trait (trat)
1. any genetically determined characteristic; also, the condition prevailing in the heterozygous state of a recessive disorder, as the sickle cell trait.

2. a distinctive behavior pattern.
Species Name     Description of       Question            Hypothesis:
                 Adaptation/Trait                         Reason for

Golden Frog      These brilliant      Why do these        Hand signals
(Atelopus        yellow frogs sit     frogs use hand      could be an
zeteki)          on rocks beside      signals to          adaptation to
                 rushing streams or   communicate         the roar of
                 rivers and wave      even though they    rushing
                 their front legs     can make vocal      water, which
                 at one another to    calls?              drowns out
                 communicate. The                         the sound of
                 cascading water is                       the frogs'
                 extremely loud.                          calls.

Suriname Toad    Most frogs flick     Why do they eat
(Pipa pipa)      out their tongues    with their
                 to catch food.       fingers and not
                 These frogs eat      their tongues?
                 with their

Class Frog       Females lay eggs     Why lay eggs on
(Centrolenella   on leaves            leaves above the
fleishmanni)     overhanging          stream instead of
                 streams. Males       in the water?
                 guard eggs until
                 they hatch. Newly
                 hatched tadpoles
                 fall off leaves
                 and plop into

Don't Stop Now: What steps might you take to confirm each hypothesis?
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Publication:Science World
Date:Mar 11, 2002
Previous Article:Quiz. (Science In The News).
Next Article:Biodiversity hotspots. (Chart-Reading Activity).

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