| A) | Agency, Approach, Arrival |
| B) | Back and forth, Binoculars, Biologist, Bird, Bobbing, Branches, Breed, Brown |
| C) | Call, Call back, Call out, Canopy, Captivity, Catnapping, Change, Chick, Climate, Collide, Competition, Conservation, Creature, Crevice, Crossbreeding, Cull |
| D) | Dark, Disappear, Disruption, Drowsy |
| E) | Eating, Echo, Eggs, Encroach, Endangered, Endangered Specie Act, Environment, Environmentalist, Existence, Expansion, Eyes |
| F) | Fear, Feast, Feathers, Federal, Female, Finicky, Flutter, Food, Forest |
| G) | Genus, Gnaw, Government, Ground |
| H) | Habitat, Habits, Hard to find, Harm, Hatch, Hatchling, Haven, Head, Healthy, Hear, Hide, History, Hollow, Hoot, Hunter, Hunting |
| I) | Industry, Influence, Influx, Invade, Isolated |
| L) | Land, Landing, Lawsuits, Loggers, Lure |
| M) | Male, Manager, Marksman, Mate, Medium-sized, Migrate, Migration, Mottled, Mysterious |
| N) | Nap, Natural, Nature, Nemesis, Nest, Night, Nocturnal, Noise |
| O) | Observe, Offspring, Old-growth, Optimism, Outcry, Owl |
| P) | Patch, Pattern, Plan, Population, Protect, Protection |
| Q) | Quality, Quantity, Quest, Questions |
| R) | Range, Rare, Region, Regulation, Relationship, Remaining, Research, Rival |
| S) | Scale, Scientist, Scratch, Shooting, Sickness, Sighting, Silence, Size, Skies, Sky, Sound, Space, Specie, Strix, Subspecies, Survival |
| T) | Talon, Thief, Threat, Threat, Threatened, Timber industry, Tree, Treetop, Tufts, Turf, Twitter |
| U) | Unblinking, US Forest Service |
| V) | Vegetation, Vocalize, Volatile |
| W) | Watch, Weather, Wildlife, Woods |
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