| Solution | Length | |
|---|---|---|
| 3 letters | ||
| pes | 3 | |
| ova | 3 | |
| 4 letters | ||
| dian | 4 | |
| 5 letters | ||
| fauna | 5 | |
| 6 letters | ||
| mating | 6 | |
| animal | 6 | |
| 8 letters | ||
| botanist | 8 | |
| 9 letters | ||
| anatomist | 9 | |
| zoonomist | 9 | |
| biologist | 9 | |
| ecologist | 9 | |
| 10 letters | ||
| ETHOLOGIST | 10 | |
| naturalist | 10 | |
| GENETICIST | 10 | |
| BIOCHEMIST | 10 | |
| cytologist | 10 | |
| zoographer | 10 | |
| biometrist | 10 | |
| 11 letters | ||
| mammalogist | 11 | |
| TAXIDERMIST | 11 | |
| OPHIOLOGIST | 11 | |
| 12 letters | ||
| zoophysicist | 12 | |
| PHYSIOLOGIST | 12 | |
| entomologist | 12 | |
| malacologist | 12 | |
| biophysicist | 12 | |
| conchologist | 12 | |
| 13 letters | ||
| herpetologist | 13 | |
| zoo-ecologist | 13 | |
| zootaxonomist | 13 | |
| ichthyologist | 13 | |
| ornithologist | 13 | |
| 14 letters | ||
| protozoologist | 14 | |
| bacteriologist | 14 | |
| anthropologist | 14 | |
| zoopathologist | 14 | |
| 15 letters | ||
| helminthologist | 15 | |
| 17 letters | ||
| natural-scientist | 17 | |
| 19 letters | ||
| animal-physiologist | 19 | |