Native east of the Continental Divide in Wyoming, American Bullfrogs are commonly released by schools and pet owners. Unfortunately, Bullfrogs have successfully colonized some aquatic areas in western Wyoming. They are voracious predators and may eat native reptiles, amphibians, fish, mammals, and birds. Bullfrogs can also spread diseases to native amphibians. Bullfrog tadpoles or eggs should also not be released into the wild.
Very common as pets, goldfish are often released into the wild and have established breeding populations in Wyoming. Goldfish may grow much larger when released into the wild and reproduce quickly, disrupting the ecosystem. They may compete with native fish for habitat and spread diseases.
Often bought as aquarium fish for their bright colors, as adults they are aggressive toward other fish and quickly outgrow their tanks. This voracious fish has been introduced into several U.S. waters and has caused problems for other fishes. Snakehead are illegal to buy or sell in Wyoming.
Photo Credits: Burmese Python, Cellistka; Snakehead, Chungking; Goldfish, Andrew Burgess; American Bullfrog, WilleeCole; Tadpoles, Dabjola