Your students will enjoy this massive list of different types of animals and insects in Spanish. One of my favorite activities is having the students combine different animals to create a "zoo" (wall art display) of "Animales Fantasticos!" The students choose three animals or insects, combine them together, and DRAW them. For example: Elepajasaurio = Elefante/Pajaro/Dinosaurio.
Their creations are always interesting, and it makes for fun conversation.