It's easy bein' green

Kermit the Frog is puppeteer Jim Henson's first and most famous Muppet (sorry Miss Piggy). First introduced in 1955, his hit, Bein' Green, was written in 1970 for the first season of Sesame Street.

It's not that easy being green
Having to spend each day the color of the leaves
When I think it could be nicer being red, or yellow or gold
Or something much more colorful like that

It's not easy being green
It seems you blend in with so many other ordinary things
And people tend to pass you over 'cause you're
Not standing out like flashy sparkles in the water
Or stars in the sky

But green's the color of Spring
And green can be cool and friendly-like
And green can be big like an ocean, or important
Like a mountain, or tall like a tree

When green is all there is to be
It could make you wonder why, but why wonder why
Wonder, I am green and it'll do fine, it's beautiful
And I think it's what I want to be

Kermit, who was performed by Henson until his death in 1990, is the spokefrog for many Muppet projects (most notably as the host of The Muppet Show) and has appeared in various sketches on Sesame Street, commercials, and in public service announcements over the years.
 
Kermit also performed the hit single The Rainbow Connection in 1979 for The Muppet Movie, the first feature-length film featuring Henson's Muppets. Kermit was credited as the author of Before You Leap: A Frog's Eye View of Life's Greatest Lessons, which is an "autobiography" told from the perspective of the character himself.