| No. | Term | Definition |
|---|---|---|
| 1. | Abyssal fish | Deep-sea fish from ocean trenches. |
| 2. | Albatross | Large seabird that glides over oceans. |
| 3. | Anchovy | Small schooling fish, often eaten. |
| 4. | Anemone | Stinging polyp; shelters some fish. |
| 5. | Anglerfish | Deep-sea fish with a lure. |
| 6. | Barnacle | Crustacean that sticks to surfaces. |
| 7. | Barracuda | Fast predatory fish with sharp teeth. |
| 8. | Basking shark | Huge plankton-feeding shark. |
| 9. | Beluga | White whale found in Arctic seas. |
| 10. | Blue whale | Largest animal on Earth. |
| 11. | Bottlenose dolphin | Common dolphin with a short beak. |
| 12. | Carpenter shark | Small tropical shark; reef-dweller. |
| 13. | Catfish (marine) | Saltwater fish with whisker-like barbels. |
| 14. | Clam | Bivalve mollusk with two shells. |
| 15. | Clownfish | Reef fish living among anemones. |
| 16. | Cod | Cold-water food fish. |
| 17. | Conch | Sea snail with a spiral shell. |
| 18. | Coral | Colony animal building reef structures. |
| 19. | Crab | Side-walking crustacean with claws. |
| 20. | Cuttlefish | Cephalopod with internal shell. |
| 21. | Damselfish | Small, territorial reef fish. |
| 22. | Dolphin | Intelligent marine mammal; breathes air. |
| 23. | Dugong | Seagrass-eating marine mammal. |
| 24. | Eel | Long, snake-like fish. |
| 25. | Emperor penguin | Large Antarctic seabird that swims. |
| 26. | Feather star | Crinoid with feathery arms. |
| 27. | Fire coral | Stinging reef animal, not true coral. |
| 28. | Flying fish | Fish that glides above waves. |
| 29. | Foraminifera | Tiny shelled protists in plankton. |
| 30. | Fur seal | Eared seal with thick fur. |
| 31. | Gannet | Seabird that plunge-dives for fish. |
| 32. | Giant clam | Large reef bivalve with symbionts. |
| 33. | Giant squid | Very large deep-sea squid. |
| 34. | Goblin shark | Deep-sea shark with protrusible jaws. |
| 35. | Green sea turtle | Herbivorous sea turtle of warm seas. |
| 36. | Grouper | Large reef fish, often ambush predator. |
| 37. | Gull | Common coastal seabird. |
| 38. | Hammerhead shark | Shark with a wide, hammer-shaped head. |
| 39. | Harbor seal | Common seal of temperate coasts. |
| 40. | Hermit crab | Crab using empty shells for shelter. |
| 41. | Herring | Silvery schooling fish, important prey. |
| 42. | Horseshoe crab | Ancient arthropod with hard shell. |
| 43. | Humpback whale | Baleen whale known for songs. |
| 44. | Jellyfish | Gelatinous drifter with stinging tentacles. |
| 45. | John Dory | Flat-bodied fish with a dark spot. |
| 46. | Kelp bass | Coastal fish living in kelp forests. |
| 47. | Killer whale | Orca; large predatory dolphin. |
| 48. | King crab | Large crab from cold oceans. |
| 49. | Krill | Small shrimp-like planktonic crustacean. |
| 50. | Leatherback turtle | Largest sea turtle; leathery shell. |
| 51. | Limpet | Cone-shelled snail clinging to rocks. |
| 52. | Lionfish | Venomous reef fish with spines. |
| 53. | Lobster | Large clawed crustacean, bottom-dweller. |
| 54. | Manatee | Gentle aquatic mammal that eats plants. |
| 55. | Manta ray | Large ray that filter-feeds. |
| 56. | Marlin | Fast billfish with spear-like snout. |
| 57. | Monk seal | Rare seal living in warm waters. |
| 58. | Moray eel | Eel with large jaws, reef crevices. |
| 59. | Mussel | Bivalve that attaches by byssal threads. |
| 60. | Narwhal | Arctic whale with a long tusk. |
| 61. | Nautilus | Shelled cephalopod with chambered shell. |
| 62. | Needlefish | Slender fish with long jaws. |
| 63. | Ocean sunfish | Large, disk-shaped fish; molas. |
| 64. | Octopus | Eight-armed cephalopod; very intelligent. |
| 65. | Oyster | Edible bivalve; some make pearls. |
| 66. | Parrotfish | Reef fish that grazes algae. |
| 67. | Pelican | Seabird with a large throat pouch. |
| 68. | Penguin | Flightless seabird adapted for swimming. |
| 69. | Periwinkle | Small intertidal sea snail. |
| 70. | Piranha (marine) | Often misused; true piranhas are freshwater. |
| 71. | Plankton | Drifting small organisms in seawater. |
| 72. | Porpoise | Small toothed whale, blunt snout. |
| 73. | Pufferfish | Fish that inflates; often toxic. |
| 74. | Quahog | Hard clam from Atlantic coasts. |
| 75. | Queen angelfish | Colorful Caribbean reef fish. |
| 76. | Ray | Flat-bodied cartilaginous fish. |
| 77. | Red snapper | Popular food fish of warm seas. |
| 78. | Remora | Fish that attaches to larger animals. |
| 79. | Rockfish | Spiny fish common in rocky reefs. |
| 80. | Sailfish | Very fast billfish with tall fin. |
| 81. | Salmon | Migratory fish; many species spawn in rivers. |
| 82. | Sand dollar | Flat sea urchin of sandy bottoms. |
| 83. | Sand shark | Common name for several shark species. |
| 84. | Sea lion | Eared seal; agile swimmer. |
| 85. | Sea otter | Marine mustelid that uses tools. |
| 86. | Sea slug | Shell-less marine gastropod. |
| 87. | Sea snake | Venomous snake adapted to sea life. |
| 88. | Sea star | Echinoderm with radiating arms. |
| 89. | Sea urchin | Spiny echinoderm that grazes algae. |
| 90. | Seahorse | Fish with upright posture and curled tail. |
| 91. | Seal | Marine mammal with flippers. |
| 92. | Shark | Cartilaginous predatory fish. |
| 93. | Shrimp | Small crustacean with long antennae. |
| 94. | Sponge | Simple filter-feeding animal. |
| 95. | Squid | Cephalopod with tentacles and fins. |
| 96. | Stingray | Ray with a venomous tail spine. |
| 97. | Swordfish | Large fish with a long bill. |
| 98. | Tadpole shrimp | Ancient crustacean; mostly freshwater. |
| 99. | Tuna | Fast ocean fish; powerful swimmer. |
| 100. | Uria (guillemot) | Seabird that dives for fish. |
