The bird in Vietnam with a blue or white line on the base of the neck could be:
1/ Birds of the genus Niltava
The birds in Vietnam with blue color on the throat could be:
1/ Blue-bearded bee-eater (Nyctyornis athertoni)
2/ Bluethroat (Luscinia svecica)
The difference between the Asian Barred Owlet and the Collared Owlet:
1/ Asian barred owlet (Glaucidium cuculoides), also known as the cuckoo owlet
- Head: barred;
2/ The collared owlet (Taenioptynx brodiei), also known as the collared pygmy owl
- Head: spotted
The bird in Vietnam with bright orange color on the throat could be:
1/ Sapphire flycatcher (Ficedula sapphira)
2/ Red-breasted flycatcher (Ficedula parva)
3/ Bluethroat (Luscinia svecica)
4/ Taiga flycatcher or red-throated flycatcher (Ficedula albicilla)
What is the name of the bird in Vietnam with spangles on the body:
1/ Blue whistling thrush (Myophonus caeruleus)
The birds in Vietnam without tail (or with tail too short to be seen) could be:
1/ Pygmy cupwing (Pnoepyga pusilla) or pygmy wren-babbler
2/ Grey-bellied tesia (Tesia cyaniventer)
3/ White-browed piculet (Sasia ochracea)
4/ King quail (Synoicus chinensis), also known as the blue-breasted quail, Asian blue quail
5/ Japanese quail (Coturnix japonica), also known as the coturnix quail
The difference between the Abbott's Babbler and the Buff-breasted Babbler:
The difference between the Black-backed Dwarf-Kingfisher and the Ruddy Kingfisher:
1/ Black-backed Dwarf-Kingfisher: black and blue back, very short tail, white ears
2/ Ruddy Kingfisher: ruddy back
The birds in Vietnam with a white cap could be:
1/ White-capped redstart or white-capped water redstart (Phoenicurus leucocephalus)
What is the name of the bird in Vietnam with a brown or dark brown stain around the bill?
1/ Clicking shrike-babbler (Pteruthius intermedius)
Male
2/ Blue-winged leafbird (Chloropsis moluccensis)
3/ Golden-fronted leafbird (Chloropsis aurifrons)
What is the name of the bird in Vietnam with grey upper head and nape which makes it look like a man with grey hair?
1/ Daurian redstart (Phoenicurus auroreus)
Male
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,
