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

Reread the article "Rainforest Frogs: Vanishing Act?" (p. 12). Now, imagine you're a herpetologist. You are observing frogs in a tropical rainforest, 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 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 why each frog developed the trait described.
Species Name Description of Question Hypothesis:
 Adaptation/Trait Reason for
 Adaptation

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
 fingers.

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
 stream.


Don't Stop Now: What steps might you take to confirm each hypothesis?
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Publication:Science World
Date:Mar 11, 2002
Words:277
Previous Article:Quiz. (Science In The News).
Next Article:Biodiversity hotspots. (Chart-Reading Activity).
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