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Raising wood frogs, from eggs to froglets, is a practical and rewarding classroom project. Eggs are readily available in the spring and with proper care, froglets are ready for release back into the wild by mid-June. With a minimum of materials and time, students can experience one of nature's most ... [Information of the supplier]
www.naturenorth.com/spring/classrm/wfclass/Fclaswf.html
This tutorial has been developed to aid the study of morphogenetic events during early amphibian development. It is NOT intended to replace the effort of reading the text or wrestling with this material in class. It is intended as a supplement to in-class instruction and textbook resources. [Information of the supplier]
worms.zoology.wisc.edu/frogs/
Das Buch „Migration of birds“, das zum ersten Mal 1935 erschienen ist, wird auf dieser Webseite in der überarbeiteten Version von 1998 als Online-Buch zugänglich gemacht. Thema ist der Vogelzug mit Schwerpunkt Nordamerika, u.a. werden auch Informationen zu Kurzstreckenziehern, Langstreckenziehern, ... [Redaktion vifabio]
www.npwrc.usgs.gov/resource/birds/migratio/index.htm
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