So only the first 3 pictures posted by Manson concern the same bird that to me is a Blyth's Pipit, all the other one are different birds and all Richard's Pipit.
Regarding to James comments :
"According to Robson (2000), Brazil (2009), and Svensson (2009), Richard's has a long hindclaw, much longer than Blyth'. The hindclaw on the photographed bird is extremely long. Which would make it a Richard's. In addition, Svensson describes the median covert differences as a "tendency", by which I guess he means there is some overlap."
On Pipit and Wagtails from Alström (2003), measurments of hindclaw is given for RP (including ssp sinensis) and BP, and show a clear overlap, RP (including sinensis) is 11,2-23,9 and BP is 8,8-15,4.
On our concerned bird, I won't said that the hind claw is particularly long or short, so in my opinion this feature is not diagnostic as it could be in the overlap zone.
It is said that BP Hindclaw is more curved than RP, I found it hard to judge, but the LV bird is quite curved.
In the same book, it is said that : " first winter can only be identified to species by the pattern of the median coverts if at least one or two central ones have been renewed". A plate with the variation of shape of the dark center of median covert of both species is given, and the bird from LV show a very typical BP median covert shape. That is in my opinion by far the best feature to ID them.
Especially when other features fit wel :
- the bill shape for BP have to be more short and pointed than RP and with a deep base, I found myself that this vary a lot in RP so it has to be taken with caution but the following link allow to make his own opinion :
here some links of several RP for comparaison :
http://orientalbirdimages.org/se ... _ID=&pagesize=1
http://orientalbirdimages.org/se ... _ID=&pagesize=1
here some links of several BP :
http://orientalbirdimages.org/se ... _ID=&pagesize=1
http://orientalbirdimages.org/se ... _ID=&pagesize=1
- The overall shape of BP remind more a small pipit species, and is better proportionned than RP, this is clearly shown between the different pictures posted by Manson, but it is better appreciated in the field.
- upperparts of BP is more heavily streaked and contrasted than BP, but RP sinensis may also be the same. And there is some other subtle plumage differencies hard to judge on this picture, light ears covert slighty more rufous than upperpart, and upperparts more greyish tan RP, but hard to judge on worn bird.
- BP have shorter tarsus than RP, but there is a very thin overlap. But by comparing the different birds in Manson post, the first bird show clearly shorter tarsus than birds in other pics
- an interesting feature is the difference on the moulting time, it seems that in october, many BP would have not replace any or very few median covert, where RP would have replace more of them. This is more an indication than a feature, but in this bird it fit better BP than RP.
This is also in my opinion why Blyth's Pipit are overlooked here in the South, because in absence of any median covert moulted then the only reliable feature is the call.