please add them. A little water, a little fire, there great!!!

We can't have phoenixes as a separate species. All pet species have variable color genetics, but this is not applicable to a creature which consists of fire only. Feel free to create a custom fiery skin for Rocs, we don't mind elemental skins at all.

Water creatures require their own explore and some other features because they simply live in water and can't move on the ground. We do not plan to add them right now though they can appear with the future updates.

What about mantacors. They have no one color, for they are a might mix of animals. And what about hydra's, they can be any colors, as long as they have 3-5 heads they're good.

Some of these creatures have already been suggested in detail here: http://beastkeeper.com/thread/2783

Well, if you are thinking in the box, a phoenix is of fire.

However, I think this is absolutely gorgeous:

http://wood-splitter-lee.deviantart.com/art/SOLD-Posable-Water-Phoenix-248662870

Who thought one would only implement fire?

 The element Fire(more-so a heat energy) is made up of Carbon and Hydrogen, can create water, H2O. Burns into a smoke(air), and turns into ashes(organic, and heavy for flight).

MAJOR EDIT: I'm not sure what just happened but I am retyping this part and saving it in my info elsewhere!

Phoenixes have been depicted in a wide range of Mythology as half pheasant / eagle(Which would mean it can have bones, organs, etc), not completely on fire, seen as having more than one color (possibly like a rainbow effect, definitely more than one color), a bird on fire, and to have 2 head feathers similar to that of a peacock, cockatiel.. something along those lines.

  So with that, here  comes some possibly colorations.

Fire - Reds, Yellows, Oranges, Scarlets (Fireworks?)

Water - Clear, Blues, Greens, (Reflection, Any color.)

Air - Smokey, Diluted, White hues, could be lighter in color depending on the thickness of smoke. (Colored smoke?)

Ash - Forms of Gray. Dark, Light, Translucent, Black. (Also depending on how much is burned, can have stages of fire)

Plain or multi-colored.

It has the power of rebirth, fire, healing, screech (even known to be melodious), alchemy, is great at gathering resources... , can manipulate fire.. along other things if one implements more than just a single piece of its true "element".

 In mythology, it is a species.