Animal Life on Mars (1957)
In the 1957 Disneyland TV program and subsequent theatrical release of the film, Mars and Beyond speculated what astronauts would eventually find on the red planet. There were some interesting predictions of what animals future humans could find.
You can view a clip of the program here and you can find this program on the DVD set Walt Disney Treasures - Tomorrowland: Disney in Space and Beyond.
Note: I originally uploaded this clip to Dailymotion but have since moved it to YouTube.