Paschal lamb.

Somebody needs to explain to me Easter iconography. I decided to decorate Easter eggs today. It was on a whim. I figured my mother would enjoy doing an Easter craft, as the family Agatestone wasn’t doing anything else to commemorate the holiday. So, I went through the page of stickers with which we could decorate the eggs. I understand the spring picture-endowed stickers, such as a little lamb, a butterfly and two smiling daisies. What I don’t understand is the sticker depicting a turtle bedecked a red hat and licking a tulip. A mouse wearing red polka dotted bandana, being carried aloft by three balloons. A smiling snail wearing a red and blue hat, and lastly, a bird shod in black and white saddle shoes and also adorned with a hat, this time red. What does a mouse, snail and a turtle signify in the Christian tradition? And why are all the animals wearing various colored hats? Anyone?