Research show that wild green frogs, both living in contaminated suburban backyard ponds and also in relatively pristine forested ponds, can switch sexes. This sex reversal appears to be a natural condition but it is currently unknown whether these wild sex-reversed green frogs are able to breed.
5-10 cm in length
Bodies of water and have been found in a variety of habitats, living at the margins of shallow freshwater ponds, road-side ditches, lakes, swamps, and streams, and of vernal pools and other temporary bodies of water
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Image by Ryan Hodnett - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=77244435