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invasive
Woodhouse's Toad
Amphibian - Bufo/Anaxyrus woodhousii

invasive
Woodrats
Mammal - Genus Neotoma

invasive
Wrinkled Marsh Snail
Mollusk - Lymnaea (Stagnicola) caperata

invasive
Yellow Perch
Fish - Perca flavescens

invasive
Yellow Starthistle
Plant - Centaurea solstitialis

invasive
Yellow-Bellied Marmot
Mammal - Marmota flaviventris

invasive
Yellow-Breasted Chat
Bird - Icteria virens

invasive
Yuma Myotis
Mammal - Myotis yumanensis

invasive
Zebra and Quagga Mussels
Mollusk - Dreissena polymorpha / Dreissena bugensis