Tyrannosaurus

Tyrannosaurus Rex (meaning "Tyrant Lizard King") was a huge bipedal carnivore. It's the highlight of the F/A revival mod, the star of the famous movie Jurassic Park and the most common dinosaur in popular media.

The T. rex has 2 subspecies: a green one and a brown one.

Baby (<3 Minecraft Days)

 * Keeps away from player (so don't stay close to it or it will keep escaping and never hunt)

Teenage (3 - 11 Minecraft Days)

 * Will not acknowledge the player.

Mature (>12 Minecraft Days)

 * Breaks any blocks that are blocking its way (it can break blocks that are weaker than iron blocks) and will become hostile.
 * In the newest update, the Tyrannosaurus only turns hostile at 12 Minecraft days old. However, in older updates it becomes hostile at 6 MC days.

Tamed

 * Won't destroy houses. They only destroy trees after tamed.
 * Won't attack player.
 * Attacks other players.

Newborn

 * 2 blocks in length.
 * 1 block in height.

1 Day (1 Warm)

 * 4 blocks in length.
 * 1.5 blocks in height.

2 Days

 * 5 blocks in length.
 * 2 blocks in height.

3 Days

 * 7 blocks in length.
 * 3 blocks in height.

4 Days

 * 8 blocks in length.
 * 4 blocks in height.

5 Days

 * 9.5 blocks in length.
 * 5 blocks in height.

6 Days

 * 10.5 blocks in length.
 * 6 blocks in height.

Taming
In order to tame a Tyrannosaurus, it has to be at least 9 days old; you must have a scarab gem, a regular sword, and some strong armour. Next, you have to hit the T-rex to 7 HP until it looks like it's laying down (check using the dinopedia to see how much health he has, so you won't kill him), then you right-click it with the scarab gem. The dino's eyes will revert back to normal (non-red). You can now ride your Tyrannosaurus!