It is kind of like the LEGO Minifigure series. The Surprizamals stuffed animals come in a sealed package. In this case a ball, which, unsurprisingly, is called a Surprizaball.
The balls are of a solid color, so there is no way to know what stuffed animal you get until you buy it and open it. Surprizamals Stuffed Animals include 12 models in Series 1 and over 60 models in Series 2 which is launching in the Fall of 2016.
The stuffed animals in the series are collectibles. Each of them has a different production run. The series include Ellie the Elephant, Rex the Lion and Mandy the Panda which are Rare Surprizamals pets. There is also Moe the Bear who is Ultra-Rare.
Hailey the Horse, Mango the Monkey, Scruffy the Dog and Gemma the Unicorn on the other hand are the ones with the highest production runs. Prices are about $4.99 a pop. If you do come across a duplicate, you can always exchange it with a friend who has a stuffie from the series that you need. In fact, it is encouraged.