Mesozoic Marvels

The tyrannosaurus Rex is a very powerful creature that hunts exclusively at night, unless you manage to anger it by either getting too close to it or hurting it.

The tyrannosaurus Rex also has the furthest detection radius of any entity in the game (if I did this correctly) and can break through leaves and sometimes even logs.

The velociraptor doesn't do too much damage, but is very fast and can get hard to hit, because it likes to jump around quite a bit. Like the T. Rex, the velociraptor is also a nocturnal hunter and it shouldn't attack unprovoked or if it isn't night time.

The carnotaurus is a very fast and powerful predator. Unlike the last two, the carnotaurus is not a nocturnal hunter.

If you are to encounter a carnotaurus, it is recommended to make sure to not let it chase you on a straight path / in a flat terrain, as its high speed can be very dangerous in those areas. Another benefit to keeping it out of these areas is that its speed makes it slip fairly easily and Minecraft's ai can easily be duked like this (this does technically apply for all really fast things, but I thought I'd mention it here, because I'm pretty sure that the carno has a unique tail structure that lets it go faster in straight areas, but makes it really bad at changing direction.

The yutyrannus is a feathered carnivorous dinosaur that hunts at night.

The triceratops is a herbivorous dinosaur that can get very territorial and often aggrevates against nearby carnivores or the player.

Not many carnivores hunt triceratops, as it is very powerful and can, in some cases, kill even the tyrant lizard king.