| WARMBLOODEDNESS | Ardent condition, characteristic of mammals and birds (4,11) |
| HIPPOCRATICOATH | Doctor takes this large mammal and this small one in chaotic hybrid |
| UREA | Organic compound found in the urine of mammals and synthetically produced to create a high nitrogen- |
| HEEL | The back part of the human foot, which corresponds to the point of the hock of hoofed mammals and those that walk on their toes (4) |
| RENNIN | Milk- curdling enzyme occurring in the gastric juice of young ruminant mammals and widely used in the production of cheese; also called chymosin (6) |
| MOLLUSCS | Cape gulls eat fish, worms,___, smaller birds, small mammals and vermin. |
| MANDIBLE | A bone of the lower jaw in mammals and other vertebrates (8) |
| CONCEAL | Study sound of marine mammal and keep out of sight |
| KITE | Bird of prey taking young mammal and beginning to eat |
| BAT | Flying mammal and suspected cause of COVID-19 |
| CORFU | Immortalised in Gerald Durrell's autobiographical trilogy that includes My Family and other Animals and Birds, Beasts and Relatives, one of the greenest of the Greek islands (5) |
| DURRELL | Author of The Bafut Beagles and Menagerie Manor whose Corfu autobiographical trilogy includes My Family and Other Animals and Birds, Beasts and Relatives (7) |
| HIPPO | Semi aquatic mammal and ungulate with a lifespan of 40 to 50 years (abbr) (5) |
| SEALANT | It protects mammal and insect (7) |
| OCTETTE | Group seeing tailless mammal and so on climbing within |
| NATHANWHALE | ... a marine mammal and a Revolutionary War spy? |
| SEA | Tailless marine mammal and its habitat (3) |
| GIRAFFE | Large African mammal and tallest living animal (7) |
| HORSESHOEBAT | Mammal and steed both sea-sick (9,3) |
| ELEPHANTSEAL | Marine mammal and mammoth, perhaps close up (8,4) |
