ACROSS
1. Solid matter settling to the bottom of a lake (8) 5. Secreted milk (8) 9. Small, globular citrus fruit with greenish-yellow skin (5) 10. Animal's retreat or den (4) 11. Out of sight or not noticed (6) 12. Leaf veins (8) 14. Genus 17. Fenced or caged area for keeping animals (9) 19. Amount produced by a crop (5) 21. Senegalese capital (5) 22. Place in order (7) 23. Collective term for rhinos (5) 25. The _____head Persian is a breed of fertile, tough sheep originating in Somalia (5) 27. Point on Earth's surface directly above an earthquake's origin (9) 29. Laying material around the base of a plant for protection, nutrition or water retention (8) 32. The southern African ________ () is a sharp-spined, insectivorous mammal (8) 33. The thrush genus (6) 34. Short-winged, black-and-white seabirds of the Alcidae family (4) 35. Ethical (5) 36. Of a plant, produced its own reproductive structures without human intervention (8) 37. Break in a journey (4,4)
