[Kerala Birds]

1. I think the extent of rufous look in range for Blue-tailed based off of images on eBird. Tail shape, with the longer central feathers, all supports Blue-tailed. 

2. I can't really help with this one, but it does seem that Kentish Plovers usually have darker legs, and these ones are pretty pale. 

3. Strikes me as a Wood Sandpiper

4. First impression was some accipiter, but I can't find a perfect match on eBird...

[Southeast Asian Birds]

Blue Whistling-Thrush is a much better suggestion for #4! I think that's a good fit. 

[Is This a Yellow-bellied Seedeater? (Caldas, Colombia)]

I would agree with Yellow-bellied Seedeater. 

[What bird is this (Kauai)]

Structurally it strikes me as a House Sparrow, so maybe one that's been stained?

[Rajasthan Birds]

1. Ruff

2-3. Indian Chat perhaps? Also known as Brown Rock Chat. 

4. Maybe the same as above.

5. Domestic swan geese

[Caribbean Bird Aaruba]

1. Scaly-breasted Thrasher

2-3. House Sparrows

4. Well it looks like a mockingbird, and the only one on Curacao is Tropical Mockingbird. Maybe a little disheveled? Doesn't look like a typical Tropical to me. 

5. I think it looks better for a Saffron Finch, or some other finch (St. Lucia has Grassland Yellow-Finches). 

[Some kind of parrot seen at Iguazu Falls Argentina]

I think Scaly-headed Parrot matches the best -- especially with the bright red vent, and some of the scaly patterning is visible in the head. It looks as if they vary quite a bit with the amount of blue in the head and white around the eye. 

Iguazu Falls is too far south for Blue-headed Parrots as well. 

[2 hummngbirds from Roatan, Honduras]

Both appear to be Canivet's Emeralds. 

[Berlin Birds]

1 and 2 look correct. 

3 looks better for a young Eurasian Blackbird. 

4. Young Eurasian Sparrowhawk, probably

[Identify some birds in Costa Rica]

32. some kind of Elaenia... probably Yellow-bellied Elaenia, but I'm not confident on that. 

33. Black-and-white Warbler

34. female Summer Tanager I believe

35. Myiarchus species (a genus of flycatchers)... I personally won't be able to identify this. 

36. White-eared Ground-Sparrow

37. Rufous-collared Sparrow

[Identify some birds in Costa Rica]

30. Purple-throated Mountain-gem. Location always helps, but turns out female White-bellied Mountain-gems actually look considerably different, and there are just mis-identified photos online. 

31. Common Tody-Flycatcher

[Identify some birds in Costa Rica]

26. I think this could fit Green-crowned Brilliant better, just as there isn't much copper in the rump and the tail has a more bluish iridescence. I personally probably can't put a confident ID on it just with the back though. 

29 is a juvenile Green-crowned Brilliant. 

What was the location for #30? It's a female mountain-gem, and they have pretty distinct ranges to help separate them. 

 

[Identify some birds in Costa Rica]

25. Sooty-faced Finch

27. Looks like it. 

28. Coppery-headed Emerald

 

I can look at the others later today unless IvoryBillHope beats me to them. 

[Identify some birds in Costa Rica]

Olive-backed and Yellow-crowned are the only euphonias supposed to be in that park according to eBird, so I think that Olive-backed is a safe bet. 

17. Looks good for a Rufous-tailed Hummingbird. 

[Help identifying bird - Ecuador]

Short tail and brighter colour favour White-bellied (as does frequency in that park). 

[Bird seen at the coast in Menorca, Spai]

Structure, face pattern, and bill are off for a lark. Lesser Short-toed Lark has also not been reported in eBird in that province before. 

Face pattern matches Eurasian Linnet quite well. 

[Identify some birds in Costa Rica]

6. Euphonia sp, do you have a more exact location in the country? Olive-backed would be my guess with the minimal rufous on the lower belly.

16. Chestnut-sided Warbler

[Spain #4]

1. Green Sandpiper -- I think of it as the European version of our Solitary Sandpiper

2. Black-headed Weavers

3. Wood Sandpiper -- their version of our Lesser Yellowlegs

[Southeast Asian Birds]

1. Gray-breasted Prinia - similar to Ashy but has the darker collar across the breast (I can't find Ashy records for Myanmar on eBird either)

2. Initial thought was some species of spiderhunter or sunbird

3. Yes, domesticated guineafowl

4. Chinese Blackbird I believe

5. Likely another Chinese Blackbird

[Birds of Kenya and Tanzania updated]

2. Spotted Morning Thrush

3. I would agree with Chestnut-bellied Sandgrouse 

5. Spotted Morning Thrush

7. Wood Sandpiper

8. Grey-headed Kingfisher

9. Wood Sandpiper

14. Marsh Sandpiper, I believe

19. Rock Martins

26. Looks like another Wood Sandpiper

Pass on the rest...

[Need help identifying birds from Europe: France, Prague, Budapest, Rome & Venice]

1. House Sparrows

2. (Feral) Rock Pigeon

3. Black-headed Gull

4. Common Wood-Pigeon

5. Hooded Crow

6. White Wagtail

7. Yellow-legged Gull likely, but someone with better experience on juvenile gulls from Europe should probably confirm.  

8. Italian Sparrow

[Two hummingbirds near Quito Ecuador]

The most common violetear in Quito is Sparkling, with Lesser (split from Green) seen but not as commonly as Sparkling. The blue patch on the belly definitely fits Sparkling better than Lesser, and so I would imagine that the second image is a Sparkling Violetear as well. 

[Panama Mystery Birds - Metropolitan National Park]

Not sure if the others are identifiable, but the third looks like a Red-throated Ant-Tanager. 

[Panama Mystery Birds - Gamboa Resort]

1-4. Summer Tanager

5-7. Golden-fronted Greenlet I believe. 

[Panama Mystery Birds -- Discovery Center @ Pipeline Road]

1-4. Chestnut-sided Warbler

5. Not sure which hummingbird, a little tough with the angle

6-10. Tropical Gnatcatcher

11-17. Plain-coloured Tanagers