Khao Yai a short visit

Great set of pictures Marcnus! I especially like the first Giant Squirrel picture, and the hornbills. Also the gibbon, it has such a sad face.

Wow. 2 days only !

Lots of fresh grass/growth about so gaur at Khao Paeng Ma or Klong Pa Gang would be on the cards. Gaur on the road at night in Pang Sida and Ta Phraya also a good bet.

Pang Sida was good a couple of weeks ago - I added to my duck of once again not seeing gaur at the watchtower - but I love to sit up there.

But I find its all hit and miss at this time of year with the weather. You seem to have proven me wrong though ;+)

Flipflops may have some suggestions as he knows that area much better than myself.

Looking forward to seeing what you get wherever it is.

Nice pictures, and good score, especially lucky you got to see the Gaur!
I agree with Trekker that the Black Giant Squirrel is a very nice shot, but shouldn't it be turned counterclockwise, head facing down? Or was it really stretching its hind legs?
Not sure if I know that area much better than Trekker. Only Khao Yai I know very well (and that's only the inner parts, not the surrounding substations like Khao Paeng Ma) and Pang Sida I know a bit though not that well.
I have zero experience with Thap Lan, or Ta Phraya.
I plan to visit Thap Lan this wet season, if time allows. Hoping there is enough to do around there (like trails or interesting areas to drive (better even if possible at night)).

Since you seem to be interested in all nature, perhaps you could also add Phu Khieo wildlife sanctuary to your visit list.
But Huai Kha Khaeng is also fantastic. Just returned from a week in HKK and have seen a lot:
Banteng, Elephants, 2 Hog badgers!, Golden Jackal, Phayre's Langur, Long-tailed Macaques, Wild Boar, Sambar -, Eld's -, Hog Deer, and Red Muntjac, Asian Palm Civet, various squirrel species, couple of snakes, many lizard species, and many birds. Lots of Leopard scrapes and footprints, and some fresh huge 15cm wide tiger pug marks just 600m from our tent. Not sure if I forget anything. The wildest place in the country as far as I know.
Love it, only a shame access is so limited.