Cross Breeds - What features are UNIQUE to a Maine Coon cat?

What features are UNIQUE to a Maine Coon cat?

My newly adopted kitten (rescued cat) I am now certain is a maine coon or a maine coon cross, because he has all the features and personailty traites that match... however, is there anything physical that is unique to this breed that i should look out for?

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Maine Coon is solid, rugged, and can endure a harsh climate. Particularly distinctive is its smooth, shaggy coat. Medium to large; muscular; broad-chested; body should be long to create a well-balanced rectangular appearance. Medium width and length; square muzzle and high cheekbones; chin firm; nose medium long, slightly concave in profile. Large; well tufted; wide at base, tapering to appear pointed; set high and well apart. Large; wide set; slightly oblique setting with slant toward outer base of ear. Color should be shades of green, gold, or copper, but blue and odd-colored eyes are acceptable in white cats. No relationship between coat and eye colors. Long; wide at base, and tapering; fur long and flowing. Heavy and shaggy; silky with coat falling smoothly; shorter on shoulders and longer on stomach and britches; frontal ruff desirable. All colors and patterns except for the pointed colors and pattern that would indicate hybridization. Delicate bone structure; undershot chin; crossed eyes; kinked tail; buttons; lockets; or spots.
Maine Coon cats are really big when grown up.
http://www.youtube.com/watch?v=RlVHs0Wo9S0
Long hair in between pads on their feet is a pretty good indication that the cat has some Maine Coon in them. Growing up we always had Maine Coon cats. They are my favorite breed.
theyre big
They chirp at people ... that's got to be a unique feature of these beautiful cats. Most other cats only chirp at things like birds or moths. Have a look here - it's all about the history & legends associated with Maine Coons & it's a good, easy read write up that tells you what is different about a Maine Coon. http://mainecoonrescue.com/history.html
There are many Domestic Shorthair cats (mixed breed cats) that look like Maine Coons. They are actually a fairly average looking long-haired cat, except for their size. Purebred cats are generally so expensive & well-protected (kept strictly indoors & sold with spay/neuter contracts unless show cats) that very few get out & have 'mixes' like happens with dogs, so the chances are slim he is anything other than a Domestic Longhair. Enjoy his uniqueness for what it is!
their fur and size