Kaytee Kay Kob Bedding for Birds, 8-Pound

Why 25 pound bag is priced at 17 and 40 pounds at 40.....my math sucks or they are tricking you to think the 25 pounds is a good deal?

Can I use this for my 8 week old bunnies litter box?

Can I use this on the floor of my Silky chickens house?

What kind of litter scoop works for this??