Related by context. Frequent words. (Click for all words.) 63 whitebark pine 56 Greater Yellowstone Ecosystem 56 Yellowstone ecosystem 55 Yellowstone grizzlies 54 mountain pine beetles 54 sagebrush habitat 53 acorns 53 bee pollination 53 beetle infestations 52 piñon 52 habitat fragmentation 52 deciduous forests 52 caribou herd 51 snowshoe hares 51 jack pine 51 forbs 51 grassland habitat 51 Grizzly bears 51 native pollinators 50 Invasive plants 50 grizzly bears 50 mountain caribou 50 lichen 50 lodgepole pine 50 marbled murrelets 50 Servheen 49 grassland birds 49 redpolls 49 berry bushes 49 aspen trees 49 habitat degradation 49 aspen stands 49 amphibian populations 49 habitat 49 overhunting 49 lowland forests 49 species 49 marbled murrelet 49 ptarmigan 48 bee populations 48 huckleberries 48 elk herds 48 acorn crop 48 Honey bees 48 sawfly 48 Mule deer 48 red legged frogs 48 hickory nuts 48 Sea otters 48 insect populations 48 tent caterpillars 48 hickories 48 pest insects 48 snowshoe hare 48 upland birds 48 honey bee colonies 48 beetle infestation 48 adelgids 47 grizzlies 47 elk moose 47 conifer trees 47 megafauna 47 Warming temperatures 47 cacao tree 47 honeybee colonies 47 aspen 47 kangaroo rats 47 Soil erosion 47 chestnut blight 47 subsistence hunters 47 ungulates 47 keystone species 47 overgrazing 47 waterfowl populations 47 freshwater ecosystems 47 Bighorn sheep 47 ungulate 47 Puget Sound orcas 47 owl habitat 46 moth larvae 46 bobwhite 46 beetle larvae 46 elephant herds 46 wolf predation 46 nesting habitat 46 elk herd 46 woodland caribou 46 Gypsy moths 46 buffalo herds 46 overfishing pollution 46 bee colonies 46 aquatic ecosystem 46 loosestrife 46 winegrapes 46 National Elk Refuge 46 lodgepole pines 46 holly berries 46 pollinating insects 46 gypsy moth caterpillars 46 pine marten 45 lichens