These thematic pictures of Птицы are analogous to a visual dictionary. The theme "Птицы" 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 russian language, which is not your native language.
To expand your russian language vocabulary on the "Птицы" topic, flashcards games are the best way: