Amphibians (frogs, toads, and salamanders) are an important part of the ecological balance of many habitats. They are like sponges, soaking up water and air through their skin. Anything found in their environment becomes a part of them, making them prone to localized sources of contamination. They are, therefore, good indicators of environmental health. Current research efforts are ongoing to identify and quantify threats to amphibian populations and to provide useful information to park managers on environmental conditions.
An early study identified nine species of salamanders, eight species of frogs, and one toad in CVNP. Most of these species can be heard or seen along remnants of the Ohio & Erie Canal that run the length of the park and in many of the wetlands and ponds that dot the landscape. A short walk on the Towpath Trail on a late spring morning allows visitors to hear the quick "peep-peep-peep" of the spring peeper or the low resonant "rumm-rumm-rumm" of the bullfrog. The park's salamanders are harder to find, hidden in the forest near small temporary ponds or other wet depressions. Occasionally, however, migrations of salamanders are observed during rainy spring nights as they cross roadways to reach their breeding ponds.