These thematic pictures of விலங்குகள் are analogous to a visual dictionary. The theme "விலங்குகள்" splits into several parts. For children, especially toddlers from 1 to 5 years old, it is better to divide the sets of cards over several days, or even weeks, so the information is absorbed better. Especially it is true if you are using flashcards to learn the tamil language, which is not your native language.
To expand your tamil language vocabulary on the "விலங்குகள்" topic, flashcards games are the best way: