He is 3rd from the left. 7 running bears, err I mean bigfoots.

Is Bigfoot different from the Skunk Ape or MOMO (Missouri Monster) and all the rest of these large ape creatures?

Great picture! Was this his first appearance on the Ed Sullivan Show?
He looks kind of upset. Was it because they'd just told him his time was cut from eight minutes to four, so he could only do one number? (That used to happen a lot on Sullivan.)
Perhaps these 2 YouTube songs will answer all your questions:
bye bye birdie - ed sullivan
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https://www.youtube.com/watch?v=yRLe6MfGsDo
bye bye birdie
https://www.youtube.com/watch?v=y_PZPpWTRTU
A horse is a horse, of course, of course,
And no one can talk to a horse of course
That is, of course, unless the horse is the famous Mr. Ed.
Go right to the source and ask the horse
He'll give you the answer that you'll endorse.
He's always on a steady course.
Talk to Mr. Ed.
People yakkity yak a streak and waste your time of day
But Mister Ed will never speak unless he has something to say.
A horse is a horse, of course, of course,
And this one'll talk 'til his voice is hoarse.
You never heard of a talking horse?
Well listen to this.
I am Mister Ed.
Cripes! The size is about right. Now lets see him cross-country run.