| 100% | ACARI | 5 | Biological sub-class containing an estimated million species including spider mites and chiggers |
| 28% | MONKEY | 6 | Primate with species including howler and spider |
| 22% | ARACHNIDS | 9 | Invertebrates including spiders and scorpions |
| 22% | ARACHNIDS | 9 | Spiders and mites |
| 22% | EAR | 3 | Organ containing an anvil and hammer |
| 21% | EYE | 3 | Organ containing an iris and a lens |
| 21% | BARACK | 6 | ___ Obama, 44th U.S. President who has different species of animals, including a Cuban spider and sea slug, named after him |
| 21% | AMPHIBIA | 8 | Class that includes newts and frogs |
| 21% | REEF | 4 | Ecosystem for an estimated 25% of all marine species |
| 21% | ANTELOPE | 8 | Class of 'deer' including impala and gazelles |
| 21% | PRIMATE | 7 | Biological order that includes apes and monkeys |
| 21% | ARACHNID | 8 | Class name for spiders and scorpions (singular) |
| 20% | BIO | 3 | Class that includes plant and animal science: Abbr. |
| 20% | NEWT | 4 | Small amphibian whose species include the Palmate, Great Crested and Smooth |
| 20% | OPEC | 4 | An oil exporting organisation that includes Iraq and Qatar |
| 20% | TWEET | 5 | Message that might include an "@" and a "#" |
| 20% | VIBURNUM | 8 | Genus of trees or shrubs whose species include blackhaw and guelder rose |
| 19% | AMPHIBIA | 8 | Class of vertebrates that includes frogs, toads, newts and salamanders |
| 19% | ARACHNID | 8 | Member of a class including ticks and scorpions |
| 19% | GLUE | 4 | Sticky supply in an arts and crafts class |
| 19% | SACKLUNCH | 9 | It might contain a sandwich and an apple |
| 19% | PELOTONS | 8 | Trendy bikes and treadmills that include online classes |
| 19% | PUMAS | 5 | Slangy name for your RS Computer shoes that contain an accelerometer and Bluetooth |
| 19% | HEROSANDWICH | 12 | Sub, and an apt description of 20-, 34-, or 42-Across |
| 19% | ELMS | 4 | Shade trees with an American and a Chinese species |
| 19% | BIO | 3 | Science class that includes zoology and botany, for short |
| 19% | AMPHIBIA | 8 | The class of animals that includes frogs and newts |
| 19% | PRIMATES | 8 | Mammals of an order that includes monkeys and apes |
| 19% | IRS | 3 | Org. whose logo includes scales and an olive branch |
| 19% | ACARI | 5 | Biological class of the honey bee parasite and The Lyme Disease tick |