Tiaronics 30 Count Woodland Animal Stickers - Animal Pattern, Reusable Vinyl Stickers for Scrapbook, Wall, Kid

Does this come with 40 separate sheets of stickers? Need to accommodate 40 children.

Can you write on the back of these with a pen. Thinking of sending these with invitations to a virtual baby shower that they can guess the babys weig

What size is each sheet?

What approx size are the animals? I see the size for each sheet, but wondering if the animal will fit on a 4 inch tall cup?