Vietnam Birding

What is that scaly bird in Vietnam?

1/ Rock thrushes (Monticola)
Female)

2/ Scaly thrush, White's thrush...  (Zoothera)

3/ Green-legged partridge (Tropicoperdix chloropus), also known as the scaly-breasted partridge or green-legged hill-partridge

The yellow-vented birds in Vietnam could be:

1/ Yellow-vented green pigeon (Treron seimundi), 
also known as Seimunds's Pintail Pigeon

2/ Yellow-vented bulbul (Pycnonotus goiavier), 
or eastern yellow-vented bulbul,

3/ Yellow-vented warbler (Phylloscopus cantator) 

4/ Yellow-vented flowerpecker (Pachyglossa chrysorrhea)

5/ Sooty-headed bulbul (Pycnonotus aurigaster)
Only some individuals have a yellow vent, some have red vent.

6/ Brown-breasted bulbul (Pycnonotus xanthorrhous)

What is difference between the Laced Woodpecker, Grey-headed Woodpecker in Vietnam?

These two woodpeckers are quite similar: gray face, black cap, red front...But the key differences are

1/ Laced Woodpecker (Gecinulus grantia)
Streaked belly.
If having red, then the red covers: front, cap, nape.
Stripes on the edge of the wing are horizontal compared to the body.

2/ Grey-headed Woodpecker (Micropternus brachyurus)
Gray, or whitish or yellowish belly.
If having red color, then the red only covers the front.
Stripes on the edge of the wing are vertical compared to the body.

What is difference between the Pale-headed Woodpecker, Rufous Woodpecker, Bay Woodpecker in Vietnam?

1/ Pale-headed Woodpecker (Gecinulus grantia)
Some with reddish front, the others with light olive-green head, rufous (reddish) wings.

2/ Rufous Woodpecker (Micropternus brachyurus)
Consistent color: either stripes of dark brown and black or rufous (reddish) and black

3/ Bay Woodpecker(Blythipicus pyrrhotis) 
Gray head or light rufous head,

Some with red color on the lower nape,

Dark (and striped) mantle,
Rufous, reddish (and striped with dark color) wings,