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Farm ponds as critical habitats for
native amphibians
A Field Guide to Amphibian Larvae and Eggs of Minnesota, Wisconsin,
and Iowa
Field guide contents
Figure 2. Field key to amphibian eggs.
Figure 2a. Frog and toad eggs. Dark lines represent distinct egg envelope borders, gray lines represent indistinct borders. |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/terrestrial/amphibians/field_guide/figure2.html
Page Contact Information: Contacting the Upper Midwest Environmental Sciences Center
Page Last Modified:
October 2, 2007
