These thematic pictures of 鸟类 are analogous to a visual dictionary. The theme "鸟类" is split 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 that the information is absorbed better. This is especially true if you are using flashcards to learn chinese(Simplified) language that is not your native language.
To expand your chinese(Simplified) language vocabulary on the "鸟类" topic, flashcards games are the best way: