Looking at this heat map,

In light of the previous question, could the color scheme be improved, and how?

Can we extract an exact value from a heat map $($without annotations$)?$

Which is higher: the number of students with pet cats, the number of faculty with pet antelopes, or we can't tell?

Which is higher: the number of students with pet antelopes, the number of faculty with pet dogs, or we can't tell?

Based on your analysis of this plot, do heat maps seem better for visualizing big differences between amounts or small differences between amounts?