There are at least two (2) Purple Heron @ Bidor and is quite a large bird with a very slender neck.
The first two photographs were taken when he sit motionless waiting for unwary prey.
(click on picture to view larger)
This third photograph was taken when I was trying to get a closer shot of him and he fledged.
This disused mining pond is teeming with water birds i.e. Wading birds (Egret, Purple Heron, Oriental Pranticole) and Water birds (The Little Grebe, Water Hens, Red Wattled Lapwing, many Black-Backed Swamphen), not a bad place indeed.