| 100% | BLUBBER | 7 | Layer of fat that insulates polar mammals |
| 52% | BLUBBER | 7 | Thick layer of fat on sea mammals |
| 40% | BLUBBER | 7 | The insulating fat layer of whales and seals |
| 37% | OMENTUM | 7 | Apron-like layer of fat over the abdomen |
| 37% | PERMAFROST | 10 | Layer of soil that never thaws |
| 36% | OZONE | 5 | Layer of atmosphere that's starting to heal |
| 34% | IONOSPHERE | 10 | Layer of the earth's atmosphere that lies above the mesosphere |
| 34% | HIPPO | 5 | Nickname of fat water-loving mammal, a river horse |
| 34% | PLATYPUS | 8 | Semiaquatic mammal that lays eggs |
| 33% | TOPSOIL | 7 | Upper layer of dirt that gardeners plant in |
| 33% | PRIMATES | 8 | Mammals of an order that includes monkeys and apes |
| 33% | BATS | 4 | Mammals that hang from the top of a cave |
| 33% | BLUMEDOLPHIN | 12 | Mammal that's trained by the author of "Superfudge"? |
| 33% | ROO | 3 | Mammal that's a symbol of Australia, for short |
| 32% | RUMINANT | 8 | Type of mammal that chews the cud |
| 32% | POTTED | 6 | __ meat, beef spread that has a fat layer |
| 32% | OTTER | 5 | Mammal that might eat 20 pounds of food per day |
| 32% | OTTER | 5 | Mammal name whose etymology is akin to that of "water" |
| 32% | EOCENE | 6 | Epoch that saw the dawn of modern mammals |
| 32% | PRIMATES | 8 | Order of mammals that includes monkeys and humans |
| 32% | PLATYPUS | 8 | Toothless "duck-billed" Aussie mammal that lays eggs |
| 32% | ORCA | 4 | Type of marine mammal that 16-Down is |
| 32% | ICING | 5 | Topmost layer of a cake, also called frosting, that is used for decoration |
| 31% | OZONE | 5 | ___ layer (region of the stratosphere that absorbs harmful solar radiation) |
| 31% | HAIR | 4 | What mammals have that other types of animals lack |
| 31% | RODENT | 6 | Type of mammal with teeth that never stop growing |
| 31% | ELK | 3 | Large mammal that's a state symbol of Utah |
| 31% | OSTRICH | 7 | Bird that lays the largest egg of any animal |
| 31% | LOUSE | 5 | Wingless parasitic insect that lives on the skin of mammals |
| 31% | MEERKATS | 8 | Highly social African mammals that appear in "Life of Pi" |