Under the mammalian, reptilia & amphibia heading...
16. Paint poorly one's NT flyer (10)
20. Could be Kate in the Congo? (5,5)
23. "When in Rome..." The old fox! (6,6)
24. A totter and slitherer (5)
And flora... Something I have no idea about!!
37. The French cat in a German river? (9)
41. Does this flower ring sadly when threatened by the Spanish? (8)
42. A purple flower with shell-like ears (10)
44. Gladys naturally welcomes the return of this native (5)
45. In return it will give you warts, Debbie! (8)