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You're in one that is all your own,

You are an act, no actors, known

As elegant, not city, land,

But you are world me and your band

Is just above an order herds

Of mammals, reptiles and of birds.

'I'm in one all my own? My body!'
'Are you in your body? Or are you your body itself?'
'Without my body am I me? Oh gosh, a troubling thought.'

Riddle Answer A Class

Riddle Explanation
you're in one that is all your own - to be in a class of one's own, or to be completely superior to all others.

you are an act, no actors, known as elegant - to be a class act.

not city, land, but you are world me - to be world-class.

your band is just above an order herds of mammals, reptiles and of birds - in biology, a taxonomic category above an order, including mammalia, reptilia, and aves (birds).