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