Related by context. Frequent words. (Click for all words.) 71 amphibian species 69 bee populations 64 amphibians 63 species 63 frog species 61 honeybee colonies 61 bird species 57 megafauna 57 species extinctions 57 mountain glaciers 57 ecosystems 56 biodiversity hotspots 56 forest ecosystems 55 waterbirds 55 bee colonies 55 aquatic ecosystems 55 leatherbacks 55 biodiversity 55 insect populations 54 extinctions 54 habitat 54 black footed ferret 54 mammal species 54 varroa mite 54 habitats 53 habitat degradation 53 Colony Collapse Disorder 53 leatherback turtles 53 whitebark pine 52 dieback 52 marine ecosystems 52 ocean ecosystems 52 coastal ecosystems 52 salamanders 52 mammals 52 genetic diversity 52 bobwhite quail 52 pikas 52 ant species 51 Invasive species 51 aquatic species 51 biota 51 boreal forests 51 deer herds 51 Populations 51 fungal disease 51 invasive species 51 woodland caribou 51 keystone species 51 migratory species 50 Steller sea lions 50 coral species 50 pollinators 50 leatherback 50 Soybean rust 50 boreal 50 frogs 50 coral reefs 49 glaciers 49 seabirds 49 harmful algal blooms 49 tropical forests 49 Overfishing 49 wintering grounds 49 eelgrass 49 Monarch butterflies 49 milder winters 49 populations 49 monk seal 49 mountain pine beetles 49 critically endangered species 49 hemlocks 49 honey bees 49 nesting habitat 49 Amphibians 49 basking sharks 49 mammal 49 wetland habitat 49 Critically Endangered 49 honeybee 49 overharvesting 49 shorebird 49 wading birds 48 temperate regions 48 marine turtles 48 bumblebees 48 toads 48 seabird 48 barred owls 48 polar bear populations 48 penguin species 48 marine ecosystem 48 white tailed deer 48 mass extinctions 48 boreal forest 48 trumpeter swans 48 monarch butterflies 48 freshwater lakes 48 critically endangered 48 biologists 47 sea otters