Red-Vented Bulbul

The red-vented bulbul is found across the Indian subcontinent, including Bangladesh, Sri Lanka, Myanmar and parts of Bhutan and Nepal. It has also been named one of the world's worst invasive species as it has been introduced to many countries including the U.S., Argentina, the Cook Islands, Tonga, Fiji and other places. 

Original range of the red-vented bulbul from Birds of the World. 

There are eight subspecies and I saw at least two of them, but I'm not sure which two. First, I saw them in Kaziranga NP in Assam, India. I saw them in the Eastern Range, the Burhapahar Range and near where we stayed at Diphlu Lodge. Later we saw one in the courtyard of our hotel in Jaipur as we were leaving for Delhi to fly home. 

This one, in the Burapahar Range has a yellow under-belly, yellow tips of the tail and a brown patch about where its ear is. 

The red-vented bulbul has a crest which gives its head a squarish appearance. The body is dark with a scaly pattern and the head is darker or black. The rump is white and the vent is red. It has a long black tail tipped in white. The Himalayan subspecies have a more prominent crest and are more streaked on the underside. The Bengal subspecies has a dark hood, lacks the scale-like pattern on the underside but has dark streaks on the pale lower belly. 

These, found in the Eastern Range, have white tail tips, show the full crest, and have the brown ear patch. 

This one appears to have a white ear patch. 

Near the Diphlu Lodge.

This one, in Jaipur, has a very dark head and does not have the brown ear patch. 

It is a beautiful bird. I wish I could have gotten some better photos and seen it in more places.