HOW TO USE THE GUIDE 27 
the larger bird, whereas amongst the Ducks the 
female is often considerably smaller than the male. 
As the measurement of size is taken in one 
dimension only, that of length, any exceptional 
length of tail, bill or neck obviously makes a bird 
look smaller than its real size, 1.e.— 
Cause of Increased Approx. 
Bird. Length. Length. No. in Guide. 
Pheasant — Tail 35 page 58 
Common Cormorant Neck 36° 58 
39 
Explanation of Diagram 
1. Irides 12. Secondaries 
2. Forehead 13. Rump 
3. Crown 14. Upper Tail Coverts 
4. Nape 15. Under Tail Coverts 
5. Lores 16. Under Wing Coverts 
6. Coverts 17. Breast 
7. Chin 18. Belly 
8. Throat. 19. Flanks 
9. Scapulars 20. Thighs 
10. Upper Wing Coverts 21. Axillaries 
11. Primaries 
Speculum = bar across wing of Ducks. 
