Twelve animals, each with a clear picture and its name spoken aloud. Animal words are among the first nouns most children use, partly because the animals are visually distinctive and partly because children are simply interested in them — which makes this an easy deck to start with.
Pets and farm animals usually come first because children meet them in books and in life. Wild animals like lion and elephant follow, generally from picture books rather than experience.
It helps. Pairing the name with the sound gives your child two routes to remember the word, and most children join in with the sound before the name.