For art we have to draw a shield with one or more colors,symbols, and animals....?

The problem is that colors can mean more than one thing. For instance, yellow can represent joy or perfidy. Green can represent nature or jealousy. Blue can mean peace or depression. Red can represent love or aggression.That's quite a range of emotion and meaning.

There's also a huge number of sites with information on what different colors symbolize, and none of them seem to agree exactly about which color represents what. So there's really not a universal, definitive answer for this question. Here's one link. It's as good as any other:

http://www.three-musketeers.net/mike/colors.html

The good news is that, since the colors can represent so many things, you can probably make almost any color work meaning-wise with the other elements on your shield. The bad news is that the symbol and animal elements are probably more important than the colors you choose, and will require a lot more work. :D

shield divided into 3 areas one is an animal (buffalo)

one is a tree one is the color green

the symbol is strength and growth

I suggest working from the other direction.

What is it you wish to represent, then decide which colors work best.

Courage, masculinity? Try reds and blues.

Serenity, harmony? Work with blues, greens and pastels.

Agression, boldness? Think warm colors like reds and orange.

no idea what the colours mean but what you can do is look up some site that does heraldic shields they usually have what the different symbols mean.