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![Woodhouse's Toad, Sam Stuckel/USFWS](https://cpw.widen.net/content/cd164b1a-83b4-4956-bb08-36b96897b7ce/web/Woodhouse%20Toad%20Sam%20Stukel%20USFWS_Profile.jpg?w=480&itok=I2PZfxc8)
invasive
Woodhouse's Toad
Amphibian - Bufo/Anaxyrus woodhousii
![Bushy tailed woodrat, NPS](https://cpw.widen.net/content/fec9d63d-eda0-411c-8c1d-dea166ba740a/web/Bushy%20tailed%20woodrat%20NPS%20Profile.png?w=480&itok=tL3wCZhP)
invasive
Woodrats
Mammal - Genus Neotoma
![This species needs a photo.](https://cpw.widen.net/content/4c3f462c-9cb0-4b0b-a3e8-2e3dd11a0592/web/This%20species%20needs%20a%20photo.png?w=480&itok=vGa_A6Rk)
invasive
Wrinkled Marsh Snail
Mollusk - Lymnaea (Stagnicola) caperata
![Yellow perch fish illustration by Joseph R. Tomelleri.](https://cpw.widen.net/content/c02450a0-e5a3-4e1f-b763-af78a70fed77/web/yellow-perch.jpg?w=480&itok=IgO5ghSc)
invasive
Yellow Perch
Fish - Perca flavescens
![USDA](https://cpw.widen.net/content/30b9befe-a3ec-434b-be35-6869586f27a4/web/Yellow%20starthistle%20USDA_Profile.jpg?w=480&itok=OKeEqKZm)
invasive
Yellow Starthistle
Plant - Centaurea solstitialis
![Yellow-bellied Marmot, Wayne D. Lewis](https://cpw.widen.net/content/9184aa4e-543f-4cee-a64d-c6fcafb87400/web/YB-Marmot-by-Wayne-D.-Lewis%20Profile.jpg?w=480&itok=LCZVxPkN)
invasive
Yellow-Bellied Marmot
Mammal - Marmota flaviventris
![Yellow-Breasted Chat, NPS.](https://cpw.widen.net/content/2f4b2d79-a797-4dd8-b496-aed9fe5dd8fa/web/yellow-breasted%20chat%20NPS%20Profile.jpg?w=480&itok=_Wsp4s8H)
invasive
Yellow-Breasted Chat
Bird - Icteria virens
![Yuma myotis, NPS](https://cpw.widen.net/content/ebeae086-5a93-42fb-ad1e-1cb07dbd6f1e/web/Yuma%20myotis%20NPS%20Profile.jpg?w=480&itok=kwhabBn6)
invasive
Yuma Myotis
Mammal - Myotis yumanensis
![Quagga mussels. NPS](https://cpw.widen.net/content/d699fc3e-d061-4f30-837b-9cae8b938ca6/web/Quagga%20Mussel%20NPS%20Profile.jpg?w=480&itok=nmnGatkK)
invasive
Zebra and Quagga Mussels
Mollusk - Dreissena polymorpha / Dreissena bugensis