Love animation, it was a big part of my life as a child, particularly Disney, Looney Tunes and Tom and Jerry, and still love it whether it's film, television or cartoons.
Also have much admiration for Tex Avery, an animation genius whose best cartoons are animated masterpieces and some of the best cartoons ever made. While the ending is an easily foreseeable one, 'A Day at the Zoo' is one of Avery's best early cartoons to me. Sometimes there was the sense that he was still finding his style at this point, but the visual and verbal humour were in classic Avery style in 'A Day at the Zoo' and there was evidence of the wild wackiness he was famous for (if not done as imaginatively as later).
It is no surprise that the animation is superb, being rich in colour and detail, the meticulousness is also noticeable. The character designs are fluid and well drawn, if not quite the creative ones of his very best cartoons. Carl Stalling's music is lush and characterful, with clever orchestration and a mastery of not just adding to the action but enhancing it as well (Stalling was a near-unequalled master at this, though Scott Bradley gave him a run for his money).
'A Day at the Zoo' is great fun and never less than amusing, the running gag never outstays its welcome and is executed with enough variety to stop it from becoming predictable and repetitive. The characters carry the cartoon beautifully and the pace is always lively without being so relentless that it feels rushed.
Mel Blanc shows once again his unrivalled ability to voice multiple characters and give each of them an individuality rather than giving them all the same personality and voice.
In summation, great. 9/10 Bethany Cox