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Nasco Grass Frogs (Rana sp.) - Size: 4-1/2"-5-1/2"; Injection: Single Lab Specimen - LS03713: Phylum Chordata Subphylum Vertebrata Class Amphibia.Preserved frogs supplied by Nasco come from a collecting area that has been renewing its population over the past 26 years because of habitat improvement by man. Nasco does not supply frogs for dissection from collecting areas that might be in danger of population depletion.Cat/Page: 1167 10 Usage Categories: Preserved Materials Grass Frogs Chordata - Amphibia Dissection and Science About Nasco In 1941, Nasco got its start by filling a need for teaching aids that were not readily available from any other source. To this day, we are proud to carry on that tradition and serve customers throughout the United States and abroad with the products they need, the quality they expect, and unbeatable customer service, all at prices they appreciate.