Cannot animals show their needs and feelings by body language and other expressions where movement is required. I do know that animals can pass on routines, methodologies and information say as in the case of "hearing dogs" and "Dogs for the Blind, but they could not develop or change it intelligently.

@Mcflewster Animals have all sorts of ways to communicate, some incredibly sophisticated ways that we are still just learning about. What they can't do is string symbols together into meaningful conversation as we are doing now. No animal can tell the difference between "man bites dog" and "dog bites man." That's what I meant, doesn't mean they aren't smart or can't communicate.