BRIimDIRDS 



EDITED BY H. F. WITHERBY, F.Z.S., M.B.O.U. 

 ASSISTED BY W. P. PYCRAFT, A.L.S., M.B.O.U. 



Contents of Number 5. October 1, 1907. 



Nestling Birds, and Some of the Problems thej present, by 

 W. P. Pjcraft, A.L.S., F.Z.S., m.b.o.U. (Part lt.)—continv.ed 

 from page 106 ... ... ... ... ... ... ... Page 129 



On the Yellow Wagtails and their Position in the British 



Avifauna, by N. F. Ticehurst, f.e.c.s., sr.B.o.ir. ... ... 133 



Wind and Flight, by F. W. Headley, M.A., m.b.o.tt. (Part II.) — 



coniinued from page \2\ ... ... ... ... ... 143 



On the Moi-e Important Additions to our Knowledge of British 

 Birds since 1899, by H. F. Witherby and N. F. Ticehurst 

 (Part IV.) — continued from page ll-i! ... ... 147 



Notes : — Interbreeding of Ring-Ousel and Blackbird. Combined 

 Nest of Whitethroat and Hedge- Sparrow (E. C. Arnold). 

 Wood-Wren in East Ross-shire (C. B. Rickett). Late 

 Nesting of the Bearded Tit (W. P. Pycraft). White 

 Wagtail in East Ross-shire (C. B. Rickett). Richard's 

 Pipit in Cornwall (C. B. Rickett). Nesting of the Lesser 

 Redpoll in Kent (Percy F. Bunyard). Nesting Sites of the 

 Common Heron (W. .J. Clarke), (Francis C. K. Jourdain). 

 Nesting Habits of Great White Heron and Common Heron 

 (R.B.Lodge). The Pacific Eider (W. J. Clarke). Red- 

 shank Breeding in Warwickshire (A. H. Etches) ... ... 15S 



Reviews : — Transactions of the Hertfordshire Natural History 

 Society, Vol. XIII., Part I. Transactions of the Norfolk 

 and Norwich Naturahsts' Society, VoL VIIL, Part III. ... 160 



NESTLING BIRDS, AND SOME OF THE PROBLEMS 

 THEY PRESENT. 



BY 



W. P. PYCRAFT, A.L.S., r.z.s., m.b.o.u. 

 Part XL 



{Coniinued from page 106.) 



Another promising field which awaits the ornithologist 

 seeking new pastures, will be found in the colouring of 

 the inside of the mouth of nesthng birds. This colouring 

 appears to be consj)icuous only in nestlings of the helpless 

 type, especially in those which are reared in dimly-lighted 



