Bears and Bunnies are probably the most loved toy animals.
There are designers who specialise in creating extensive menageries of amigurumi designs.
Though my personal favourite animals are cats, I find it hard to resist any beautifully designed animal crochet pattern.
Pattern Link 1: Ameniko (Japanese diagram and signs)
Pattern Link 2: Ameniko (Japanese diagram and English instructions)
Pattern Link 3: Ameniko (all English instructions)