sorting for breeding sorting option on den page.

so like in 15 in red would be comes into heat in 15 days. and green 0 would mean in heat then once they aren't in heat anymore the number would go back to red and how many days until next heat. i've wanted to sort my lionesses by how many days till they come into heat so i can plan breedings better but it gets confusing trying to go through each lionesses page.

anything not breedable would have N/A until they become of breeding age