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Amphibians
Father's Day

Darwin's Frogs

Darwin's Frogs
Reading Level
     edHelper's suggested reading level:   grades 4 to 6
     Flesch-Kincaid grade level:   7

Vocabulary
     challenging words:    selection, swallows, aspect, responsibility, hence, temperate, yolk, gills, offspring, theory, thoughts, length, pointy, male, inch, nevertheless
     content words:    Charles R.

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Darwin's Frogs   
1     Darwin's frogs, measuring merely 1 inch in length, are tiny amphibians living in temperate forests of southern Argentina and Chile. As their name suggests, Darwin's frogs were discovered and named after Charles R. Darwin (1809-1882), a British scientist famous for his thoughts on the theory of evolution and natural selection.
 
2     Darwin's frogs have elongated, pointy snouts and triangular-shaped heads. Their skin, decorated with occasional warts, is greenish brown. As Darwin's frogs sing, their calls remind us of cowboys' whistles for gathering their herds of cattle. Hence, locals nickname Darwin's frogs "vaquero", a Spanish word for cowboy.

Paragraphs 3 to 4:
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