Related by context. Frequent words. (Click for all words.) 59 Purple loosestrife 59 aquatic insect 58 Gypsy moths 58 Trumpeter swans 58 Basking sharks 57 Zebra mussels 57 westslope cutthroat trout 56 sea lampreys 56 migrating northward 56 rainbow smelt 55 tiger muskies 55 Vernal pools 55 redshank 55 upland habitat 55 northern snakehead 55 quaggas 55 freshwater fishes 55 mussel species 55 Flathead catfish 55 bowfin 55 freshwater habitats 55 Feral pigs 54 rusty crayfish 54 anadromous 54 wintering habitat 54 hybrid striper 54 Near Threatened 54 Sea otters 54 hellbender 54 migrated northward 54 Invasive plants 54 double crested cormorant 54 pine marten 53 voracious predators 53 By HARVEY SIMPSON 53 By Laurie Kulikowski 53 voracious eaters 53 round goby 53 arctic foxes 53 pine martens 53 Spotted bass 53 golden plover 53 invasive carp 53 mottled brown 53 Feral hogs 53 Purple martins 53 Didymo 53 round gobies 53 shortnose sturgeon 53 lampreys 53 Whales dolphins 53 frogs salamanders 53 Sockeye salmon 53 freshwater ponds 53 native cutthroat trout 52 chytridiomycosis 52 birds reptiles amphibians 52 mud minnows 52 cohos 52 species 52 Invasive species 52 merlins 52 Fin whales 52 Whooping cranes 52 plesiosaurs 52 prairie pothole region 52 Quagga mussels 52 brookies 52 Saugeye 52 frogs toads 52 megalodon 52 Yellow perch 52 Leatherbacks 52 % #F# 6v.jsn 52 Barn owls 52 overwinters 52 saltwater marshes 52 shovelnose 52 eastern Dakotas 52 amphibians reptiles 52 anadromous fish 52 Spider mites 52 tiger subspecies 52 crinoids 52 chinook coho 51 staghorn coral 51 oxbows 51 eastern lowland gorillas 51 Hydrilla 51 Blanding turtle 51 Loggerhead turtles 51 song thrush 51 Anopheles mosquitoes 51 protozoans 51 voracious carp 51 Flatheads 51 Crappie Fair 51 chain pickerel 51 % #F# 4v.jsn 51 leopard frogs 51 salties