What birds are these and why are they there ?

[Skeptic7]

4 minutes ago, bontang said:

Them Birds hang out with  Buffalo's Heard's seen them many times resting on the Buffalo's back,                Has anybody seen any Crows in Thailand, Thousands of them in Ghana Africa,

Large-billed Crow is a common, permanent resident throughout the Kingdom, found in all sorts of habitats, including cities, and altitudes.

[Briggsy]

1 hour ago, bontang said:

Them Birds hang out with  Buffalo's Heard's seen them many times resting on the Buffalo's back, 

I think you are confusing Asian Openbills (a species of stork) with Cattle Egrets (a species of egret). The Cattle Egrets do indeed associate with cows and buffaloes feeding on the insects they disturb. The Openbills have a clear two-tone colour pattern at rest while cattle egrets are either all white (winter) or white with orange (summer, breeding)

[sawadee1947]

On 7/2/2019 at 6:20 AM, BobBKK said:

They always seem to be in Chiang Mai and I assumed they were cranes of some sort?

No, they are Storks, some white, some Black. 

[rickudon]

They migrate to find fields/paddies which have shallow water to make snail hunting easy. A bit of rain will also wake up the snails. Yes spreading. Have a friend who is a bird watcher and one day we saw them flying overhead at our farm ponds in Udon. First time he had seen them around here. Ever since, see them every year. I think they like the neglected paddy fields which are common these days.

[dn012]

On 7/3/2019 at 8:41 AM, malt25 said:

"Sometimes they will ascend to 3-4000feet above the ground."  As opposed to ?

Sea level?