Reptiles and Amphibians - invasive

American Bullfrog (Lithobates catesbeianus) on Jun 19, 2018

Submitter does not have a specimen

Description of specimen

I hear what I believe to be bullfrogs coming from this pond. I have not seen them since this is private property.


Hi Kathleen,

Thanks for reporting this and for your question! American bullfrogs are an invasive species that is (unfortunately) present is many wetlands and ponds around here. It can feed on native frog eggs, preys on baby native western painted (or western pond) turtles and competes for other food sources and habitats that native amphibians and reptiles use. They can also transmit diseases and outproduce natives by laying 20,000 eggs per season (compared to our native red-legged frog which lays ~5,000 eggs). Bullfrogs are a general noise nuisance as well with their droning calls. At the Tualatin SWCD, we don't specifically contact landowners to remove invasive frogs from their ponds. We do, however, call landowners who have or may have priority invasive plant species and offer assistance to help remove such weeds.

In regards to controlling bullfrogs, I typically direct people to the Oregon Department of Fish and Wildlife. I've included a link to a useful PDF fact sheet on bullfrogs.

Bullfrogs can be legally harvested year-round, so people can remove them to eat or kill them when they occur on their property. I'm not sure if this private property belongs to your neighbor, but you could try talking to them about it. You first want to confirm that they are bullfrogs. Here is a link to a sound clip of its calls so you can compare:

Hopefully this information helps. Please let me know if you have any questions. Thanks and have a great day!

Kind regards,
Tyler Pedersen
Tualatin Soil and Water Conservation District
503-334-2288 Ext 111

Tyler Pedersen
June 20, 2018, 1:55 a.m.