Songfile.com is the licensing Website of the Harry Fox Agency. It lists the songwriters for "Be Kind to Your Webfooted Friends" as Sousa/Glazer. If it is a Glazer, it must be Tom - who is also credited with "On Top of Spaghetti." The version in the Digital Tradition appears without attribution in the 1948 edition of Song Fest.
Tom Glazer is certainly worthy of adulation - but could it really be that he's the author of these songs I've known since my youth? I think I'll stick with "anonymous," tune by Sousa.
In this thread (click) the estimable Dick Greenhaus claims that "Web-Footed Friends" "appeared first... on a Fred Allen radio show, sung, with feeling, by Portland Hoffa" (Hoffa was Allen's wife. Allen hosted network radio programs 1932-49).

In addition to the one that ended Mitch Miller's Sing Along with Mitch, I remember a slightly different version:

Be kind to your web-footed friends
For a duck may be somebody's mother
Oh be kind to the denison of the swamp
He's a dilly, through and through
You may think that this is the end
Well it isn't 'cause there is another chorus

In this thread (click), Ferrara says she remembers the same version. So it must be true, right?
-Joe Offer-