It stays dark until 7:00 am on cold winter mornings in Bharatpur. I would head to the park at 6:30 am, often the first to enter, enveloped in silence without any birdsong. The cold would pinch my arms and legs, and my hands felt like blocks of ice.
To cope with the low light, I had to increase the ISO sensitivity to 16,000 at f/4 to achieve a usable shutter speed, but this isn't ideal for photography as the high ISO introduces too much noise, spoiling the photo.
Workable light doesn't appear until around 7:15 am in December. I took this photo when the first rays of sunlight touched the left wing of a bird, which, for me, became the focal point of the image, rather than the bird itself.
Notice how the rays, coming from behind the bird, emphasise every texture and detail of its wings because the sun is much lower on the horizon at that time of day / Canon EOS 7D Mark II / Canon 300mm f/4 IS