I thought Kant's position was the concept of space is necessarily prior to experience, not just that currently-existing life-forms have it prior to experience. So it would seem that it would not validate Kant to find one example of a life-form that happens to have space hard-coded before it has experiences.
I've often wished for a list of cases where philosophy has proven useful, or has at least anticipated science in drawing correct conclusions. Here's one for the list:
The June 18 2010 Science has two very similar articles on how rat brains represent space. Both conclude that the brain already represents space as a grid before rat pups take their first steps into the world. Both make the point that this validates Kant's claim that space is an innate concept prior to experience.
(The next task is to make a corresponding list of cases where philosophers made incorrect conclusions; and estimate whether the number of correct conclusions is greater than chance.)