I came across this in The Collected Reprints from Sing Out! (Vol 1-6) [the pink one], page 235. It was a newly-written song, performed by the Babysitters on their Vanguard album. I recall Lee Hays singing lead in his booming voice.
Who were Josef Berger and Nick Klonaris?

THE LITTLE HOUSE
(Josef Berger and Nick Klonaris)

Theirs is a little house, theirs is,
In a pear tree full of pearses;
They're birds, you see, and they live in a tree
Where they don't need ladders of stairses.

They're happy and free of careses,
They never have to run from bearses;
And pears are free to birds, you see,
'Round the world or any other whereses.

Theirs is a little house, theirs is,
With little bird beds and chairses;
Did you ever hear of any house near
As nice a little house is theirs is?