Peanuts by Charles Schulz for January 26, 1972
Transcript:
Snoopy and Woodstock walk in the grass. Snoopy thinks, "Woodstock is searching for his identity."<BR><BR> Woodstock flies up in the air. Snoopy thinks, "We know he's not an eagle because he can't stand heights."<BR><BR> Snoopy watches Woodstock jump in water.<BR><BR> Woodstock sinks in the water. Snoopy thinks, "Another thing he's not is a duck!"<BR><BR>
I though he was a sparrow as it is implied in this strip. https://www.gocomics.com/peanuts/1971/07/17