1.  2. g g 3. 4.  5.  6.  7.  8.
  g   g 9. g   g   g   g   g  
10.            g 11.   
  g   g   g   g   g   g   g  
12.          g 13.     
  g g g   g g g   g g g   g g
14.  15.    g 16.    17.    18.
  g   g   g   g   g   g   g  
19.          g 20.     
g g   g g g   g g g   g g g  
21.    22. g 23.  24.    25.   
  g   g   g   g   g   g   g  
26.    g 27.           
  g   g   g   g   g   g   g  
28.           g g 29.   

ACROSS

1,3,11,16,28. Popular type of animal interaction (3, 5,5 3, 5,4, 3,4,3)

3. see 1

10. Created around funnelled section, like a rook (11)

11. see 1

12. Pass at them last, since alternately short of breath (9)

13. Wandering tours with a lifesaver perhaps (5)

14. Oddly, Mali's religion (5)

16. see 1

19. Flashy pieces as CNN kicks off (4-5)

20. Later mixed concoction? (5)

21. Duck in tundra - keep low! (5)

23. Putting speed in, laces leaves in strips perhaps (9)

26. Greek letter from within another (3)

27. Alien triers alert earthling (11)

28. see 1

29. Intended as this is, for the Across clues (3)

DOWN

1. To scorch Ian with extinct language (9)

2. Wield excerpt with two thirds removed (5)

4. Gloomy until jiggled (5)

5. Mouse catcher 'A' searches the cellars (9)

6. Bide time with cleaner (5)

7. Five frond arrangement put through cover (9)

8. Bond with the North - former American? (5)

9. Controller of HM Le Mans crew (8)

15. Paying well for mixture of vital cure (9)

16. A jolly cur confused in jest (9)

17. Soak, blend, saute rat (8)

18. Tricky arrangement - so do licks really hard! (4-5)

21. Store hard ruler - not soft head (5)

22. Sex track provides more (5)

24. Century to repeat faith (5)

25. Time right to pick food (5)