Polaris's Mobs Indian Animal Pack

Bengal Tiger

Bengal Tigers roam around searching for their next meal, they will sneak up on either Pigs, Sheep, Lion Tailed Macaques, and Northern Plains Gray Langurs when close enough they will pounce at their prey. after a kill they will not hunt any other mobs for 1 minute. Bengal Tigers will protect their cubs from any near by players, so keep your distance!
One in 64 Bengal Tigers will be white.

Bengal Tigers spawn in Jungles and Mangrove Swamps.

King Cobra

King Cobras slither along the ground, they will hunt any frog in the area. after the kill they will not seek prey for 45 seconds. King Cobras will attack the player when nearby. King Cobras can be bred with Raw Rabbit, after which one of the parents will find a place to make a nest. The eggs and nest can be obtained using shears or a silk touch tool. After placing a nest it will sit on it and guard it, breaking or being close to the nest will aggravate the cobra, when King Cobras are aggravated their hood will flare out signaling their aggressiveness.
When any mob is attacked by the King Cobra it will be inflicted with the Envenomed effect for 5 seconds, more on that effect below.

King Cobras can be Right-Clicked with a Bottle to obtain a Venom Vial, drinking it applies the Envenomed effect for 5 seconds. To make the effect of the Venom Vial longer, it can be brewed into Envenomed Potions.

King Cobras spawn in Sparse Jungles.

Gaur

Gaurs are a great source of meat and leather, better than normal cows. they can be bred with Hay Blocks but will protect their calves and will attack back when hit.

Gaurs spawn in Sparse Jungles.

Dhole

Dholes hunt in packs, they hunt Goats and Rabbits. after a kill the pack will not seek prey for 1 minute. 
When a Dhole is attacked or attacks all Dholes in an 8 block radius will target that entity, when dholes attack they will run a short distance away than come back into the fight. Dholes will protect their pups from nearby players, all Dholes will avoid Bengal Tigers.

Dholes can be tamed with Raw Rabbit, they will fight for you and can be set to Wander or Follow by Shift-Right-Click.

Dholes spawn in Sparse Jungles.

Lion-Tailed Macaque

Lion-Tailed Macaques stay in groups wandering around together, they can be bred with either Apples, Sweet Berries or Glow Berries. When a Lion-Tailed Macaque is hit all nearby macaques will flee.
When given a Melon Slice it will eat it and drop a reward, this reward can ragne from Sticks and Cocoa Beans to Golden Nuggets and even Name Tags, there is a very rare chance that the Lion-Tailed Macaque will flee without giving anything.

Lion-Tailed Macaques spawn in Jungles.

Great Indian Hornbill

Great Indian Hornbills will fly around sometimes following each other, they will sometimes seek to sit on the ground in which case all nearby hornbills will also seek to land. when attacked all nearby hornbills will flee.
Great Indian Hornbills can be bred with Melon Slices.

When killed Great Indian Hornbills will drop Hornbill Feathers, which can be used to brew Slow Falling Potions, a way to make them without suffering to get Phantom Membranes.

Great Indian Hornbills spawn in Jungles.

Northern Plains Gray Langur

Northern Plains Gray Langurs walk around in groups, the babies will avoid players. Northern Plains Gray Langurs can be bred with Leaves. When a Langur is attacked all nearby Langurs will flee.

Northern Plains Gray Langurs spawn in Sparse Jungles.

Envenomed

The Envenomed effect stops healing completely, anything with the effect will not heal naturally or with effects like regeneration.

Venom Vial

Obtained by Right-Clicking a King Cobra with a Bottle, can be drunk to be inflicted with the Envenomed effect for 5 seconds. Can be brewed into Envenomed Potions when combined with Awkward Potions in a brewing Stand.

Hornbill Feather

Dropped from Great Indian Hornbills, can be brewed into Slow Falling Potions.

King Cobra Egg

Can be harvested from King Cobra Nests using Shears or a Silk Touch tool, can be added up to four in a King Cobra Nest. if Eggs are added to a nest with cracked eggs it will reset the cycle.

Snake Nest

Can be obtained using Shears or with a Silk Touch tool, can be used as a building block. King Cobra Eggs can be placed inside the nest.