Curious to know what the bird is that makes that whooping call, I assume it's a mating call, from early morning through the day this time of year.

I can hear but never see them!

Can anyone enlighten me?

If you live in Pattaya, you might catch a glimpse of this bird moving about looking for a mate as soon as it gets dark...????

There's a pair off black naped Orioles in the tree outside my hotel room and they sound off every morning.Yellow with black wingtips and black stripe across the eyes pretty bird a bit bigger than a blackbird(UK).

Difficult to understand the sound!...but the greater caucal has a very noisy call, similar to a peacock.

however i have been to see which bird is making a very low deep rapid whooping and very surprised to see its a large grey squirrel

Yes Adammike, the Orioles we used to see near our apartment in Singapore had a very similar call but I have yet to spot one here. Wiki describe the call as a " fluty iwee wee wee-leeow" which doesn't seem to match.

The squirrel?!

This time of the year it is normally the Black Drongo. Just do a google for a youtube video to see if it matches.

Normally they are high up in the trees if they call and the sound travels quite a distance.

It's a Greater Coucal a.k.a. Chinese pheasant, although it's actually a non-parasitic cuckoo. Large red/brown birds that spend most of their time foraging on the ground, hidden in undergrowth. I had several of them in my garden in Hong Kong

 

I just took a tour of YouTube and the one that starts early and stays late near me is surely the Common Asian Koel.