Dak
mentat
This isn't entirely true; animals do innovate the way they interact with their environment. This becomes particularly obvious once humans (or any other organism, for that matter) begin to intervene and human technology begins to interfere in the environments of other organisms.
You measure that innovation based on your human perspective; again, this is "relative." Beavers obviously don't need steel or hydroelectric dams; they're survival is facilitated by their behavior as is. All human achievements and developments, while they might seem more advanced than other animals', are still the result of demands placed upon them by their environment, even those things we might not think we "need" (i.e. iPads, laptops, picture frames, hairspray, etc.).
I'm specifically not separating technology from environment; while technology presents a means of surviving in one's environment, it also becomes a part of that organism's environment (and the environments of other organisms). Thus, our own technological innovations, becoming absorbed into our natural environment, necessitate further technological advancements that may seem unnecessary on a superficial gloss.
I agree re: changes create a new environment which facilitate new changes. My point is beavers do not seem to indicate any formulation of new wants past survival.
Beaver: Builds dam.
Human: Builds house.....now wants furniture for the house....now wants eating utensils....now wants a second set of clothes...now wants a barn...and so on.
Beavers arguably impact their environment in a way similar to humans more so than any other animal so I'm using them as an easy comparison. My point is, animals do not continuously modify their environment in new ways based on previous modifications. Beavers don't build dams and then start working on a watch, or whatever. Humans go far past survival/basic instincts in their modifications.