Chameleon:

Chameleons are friendly mobs , that spawns in jungle and some forest biomes. If you want to build a zoo with them - please close area , where they living - or they will climb away. (Yeah , they can climb)

You can also tame chameleon , using spider eyes - and they will guard you and give some gifts on the morning , like a cats. To breed chameleons - use fermented spider eyes. Also if you're lucky - you can find rare white chameleon.

Chameleons will drop a new item - reptile's leather. You can make a new type of armor from this.

For everyone , who will be interested - yes , textures from Mo'Creatures mod.

Roadrunner:

Roadrunners - small birds , that will spawns in desert and mesa biomes. You can breed them with using seeds, spider eyes and fermented spider eyes. On death , or after some time - roadrunners will drop their feathers.

Textures from Alex's Mobs mod. For the moment this feathers aren't useful.

Easter Eggs:

If you watched amazing cartoon called "Rango", you may know that characters used roadrunners as rideable animals. In this add-on , if chameleons meet roadrunner - it will ride it.