I would love it if the status icons in your den had explanatory alt tags / mouseover text.

This would not only help the site be more accessible, and more newbie-friendly, but it would also help me every time I squint at a heart trying to figure out if that colour means 2 days pregnant or 3 days

I love the visual element of the icons but they're not all clearly understandable, especially if you're newer at the game. Today I saw a blue flame icon for the first time, for instance, and had no idea what it was supposed to mean - if I could just roll my mouse over it and see the word 'infertile', I'd understand immediately.