I've bought a new (to me)product for the mice this week.For use with equines it's called Rapport.Looks like aubiose but is made from the softened stalks of rape seed oil plants.Dust fee and supposedly highly absorbant,worth a try.£8.99 for a big bale.I bought a bale of hay at the same time and looked at haylage a product that looked like hay but apparently has more feeding benefit for horses.I zoomed in while working and have a tracker on my van so couldn't dilly dally and find out more.Any one know if haylage would be superior for mouse keeping.