| 100% | GORILLA | 7 | Hanabiko "Koko" the ___, primate that learned over 1,000 signs and could understand spoken English |
| 31% | GORILLAS | 8 | Largest of the primates, can learn sign language |
| 28% | PICKUP | 6 | Learn ... or a word that can precede the ends of 20-, 29-, 44- and 53-Across |
| 27% | APE | 3 | Primate that can learn ASL |
| 24% | APE | 3 | Animal that can learn sign language |
| 24% | ALUMINIUM | 9 | Element that Americans and Canadians spell differently from the rest of the English-speaking world |
| 24% | SEXTET | 6 | Group that signed the Declaration and Constitution |
| 23% | BBC | 3 | English network that airs the quiz shows "QI" and "Only Connect" |
| 23% | HANDSET | 7 | The part of a phone that you hold and speak into |
| 23% | WEEEWE | 6 | *Sheep that can't see over the pasture wall? |
| 23% | STOP | 4 | Red and white sign that makes you hit the brakes |
| 23% | LONG | 4 | Word that can fill the blanks of "So ___!" and "Go ___!" |
| 23% | STATUSQUO | 9 | English rock band whose no 1 albums include Hello! and On The Level |
| 23% | ROMANCE | 7 | Family that includes the languages spoken in 13- and 15-Across |
| 23% | FEB | 3 | Only mo. that can start and end on the same day |
| 23% | FROGS | 5 | Creatures that can freeze and thaw to survive the winter cold |
| 22% | MELD | 4 | Horse that won the St Leger, Oaks and 1,000 Guineas in 1955 |
| 22% | MELD | 4 | Horse that won the 1955 St Leger, Oaks and 1,000 guineas |
| 22% | GREATWHITE | 10 | Words that can precede the starts of 20-, 29- and 45-Across |
| 22% | BIRDS | 5 | Animals that can be paired with the words early, lady and whirly |
| 22% | CITRATE | 7 | Salt that can be derived from the acid in lemons and limes |
| 22% | CTRL | 4 | With 9-Across and 1-Down, combo that launches the task manager |
| 22% | EVIL | 4 | What the three wise monkeys can't see, hear and speak, respectively |
| 22% | MALDIVES | 8 | Nation of over 1,000 islands in the Indian Ocean |
| 22% | OMEN | 4 | Sign of the future that can be good or bad |
| 22% | SOS | 3 | Message that reads the same upside down in both English and Morse code |
| 22% | KNOTS | 5 | Word that can follow the starts of 17-, 23-, 51- and 59-Across |
| 22% | TRAP | 4 | Word that can follow the ends of 18-, 25-, 43- and 58-Across |
| 22% | FRENCH | 6 | Word that can precede the starts of 20-, 28-, 46- and 57-Across |