Can Fish Count?

More on numerosity and number cognition with Brian Butterworth - this time discussing research with animals.

A little bit of extra footage on why they do this: http://youtu.be/VuHGLBMZywo
An earlier video with Brian on dyscalculia: http://youtu.be/p_Hqdqe84Uc
And one on numbers and brains: http://youtu.be/n3x8fIdsla4