A Day at the Zoo is available on Cartoon Craze Volume 14 from Digiview Entertainment. It has not yet been released on Looney Tunes Golden Collection, as of the start of 2008.
When A Day at the Zoo aired on Cartoon Network, the brief shot of camels smoking cigarettes was cut, probably due to references of Joe Camel.
A Day at the Zoo was released in 1939.
On Cartoon Network, the part from Ain't That Ducky where the hunter shoots above Daffy's head, causing his hair to turn into that of a stereotypically black girl was cut (though some primetime showings of this cartoon aired this scene intact).
Ain't That Ducky is 7 minutes long.
Ain't That Ducky was released on May 19, 1945.