| No. | Term | Definition |
|---|---|---|
| 1. | aerie | eagle’s nest on cliffs |
| 2. | alarm call | warning vocalization |
| 3. | albatross | large oceanic seabird |
| 4. | avian | relating to birds |
| 5. | aviary | enclosure for keeping birds |
| 6. | beak | bird’s bill |
| 7. | bird feeder | device supplying bird food |
| 8. | birdbath | water source for bathing |
| 9. | birdsong | musical bird vocalizations |
| 10. | birdwatching | observing birds for enjoyment |
| 11. | brood | young birds from one hatch |
| 12. | camouflage | coloring that conceals |
| 13. | canary | small singing finch |
| 14. | chick | young bird |
| 15. | clutch | group of eggs laid |
| 16. | courtship display | behavior to attract a mate |
| 17. | dabbling duck | duck feeding at surface |
| 18. | diurnal | active mainly by day |
| 19. | down | soft insulating feathers |
| 20. | duckling | young duck |
| 21. | eagle | large bird of prey |
| 22. | eggshell | hard outer egg covering |
| 23. | egret | white heron-like wader |
| 24. | eyrie | eagle’s nest; aerie |
| 25. | falcon | fast-flying bird of prey |
| 26. | field marks | visible traits for identification |
| 27. | fledge | grow flight feathers and leave nest |
| 28. | flight feathers | wing and tail feathers for flight |
| 29. | forage | search for food |
| 30. | gannet | plunge-diving seabird |
| 31. | gape | open mouth; nestling’s mouth |
| 32. | gizzard | muscular stomach for grinding food |
| 33. | glide | fly without flapping |
| 34. | gosling | young goose |
| 35. | habitat | natural home environment |
| 36. | hatch | emerge from an egg |
| 37. | hawk | daytime bird of prey |
| 38. | heron | long-legged fishing bird |
| 39. | hibernation | seasonal dormancy; rare in birds |
| 40. | incubate | keep eggs warm until hatching |
| 41. | iris | colored ring of the eye |
| 42. | jay | noisy, colorful crow relative |
| 43. | jizz | overall impression for identifying birds |
| 44. | keel | breastbone ridge for flight muscles |
| 45. | kestrel | small falcon that hovers |
| 46. | kingfisher | fish-eating bird with big bill |
| 47. | kite | slender raptor, often soaring |
| 48. | lark | songbird of open country |
| 49. | lek | mating display gathering area |
| 50. | migratory | traveling seasonally between regions |
| 51. | molting | shedding and replacing feathers |
| 52. | murmuration | coordinated flock flight, often starlings |
| 53. | nest | structure for eggs and young |
| 54. | nestling | young bird in the nest |
| 55. | nocturnal | active mainly at night |
| 56. | oriole | bright songbird, often orange |
| 57. | ornithology | study of birds |
| 58. | owl | nocturnal bird of prey |
| 59. | pair bond | mates’ long-term association |
| 60. | parrot | hook-billed, often talking bird |
| 61. | passerine | perching bird; songbird group |
| 62. | peck | strike with the beak |
| 63. | pelican | large waterbird with throat pouch |
| 64. | perch | rest on a branch or bar |
| 65. | plumage | a bird’s feathers collectively |
| 66. | preen | clean and arrange feathers |
| 67. | quail | small ground-dwelling gamebird |
| 68. | quarantine | isolation to prevent disease spread |
| 69. | quill | hollow shaft of a feather |
| 70. | range | area where a species occurs |
| 71. | raptor | bird of prey |
| 72. | roost | rest or sleep in a place |
| 73. | ruffed grouse | forest gamebird with neck ruff |
| 74. | sandpiper | shorebird probing for food |
| 75. | scavenger | animal feeding on carrion |
| 76. | seabird | bird living mainly at sea |
| 77. | soar | fly using rising air |
| 78. | songbird | perching bird with complex song |
| 79. | sparrow | small, common seed-eater |
| 80. | species | group that can breed together |
| 81. | spectacles | eye-ring markings around eyes |
| 82. | swoop | dive quickly through the air |
| 83. | talons | sharp claws of raptors |
| 84. | tern | slender seabird, often diving |
| 85. | territory | area defended by a bird |
| 86. | thrush | songbird with rich voice |
| 87. | toucan | tropical bird with huge bill |
| 88. | tree swallow | aerial insect-eating songbird |
| 89. | underparts | belly and chest plumage |
| 90. | upland bird | nonwater gamebird of fields |
| 91. | uropygial gland | oil gland for preening |
| 92. | vocalization | any bird sound |
| 93. | vulture | carrion-eating soaring bird |
| 94. | wader | long-legged bird of shallow water |
| 95. | warbler | small insect-eating songbird |
| 96. | waterfowl | ducks, geese, and swans |
| 97. | webbed feet | feet adapted for swimming |
| 98. | wing | limb used for flight |
| 99. | wingbar | stripe across the wing |
| 100. | wingbeat | one full flap cycle |
