Size Does Matter
There are times that certain storylines of an animated film tread on the boundary of what is appropriate and inappropriate content for a family-oriented movie, especially for a big hit like Ice Age.
Source: Reddit
To be honest, when the characters include wooly mammoths, the joke related to size is being asked to be written. A scene was made in which a tapir is angry at Manny the mammoth because he was holding up traffic. The writers didn’t hold back when they made Manny say, “if my trunk was that small, I wouldn’t draw attention to myself.” That was one low blow.