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Look for the preposition "об". In Russian, this almost always signals the Prepositional case when referring to the object of a thought or care.

(To supplement feed): To provide extra food for animals, especially during harsh winter months. Quick Tips for This Lesson Look for the preposition "об"

Case: — Caring about whom? About deer (Object with preposition "об"). Они подкармливают оленей зимой. Look for the preposition "об"

Depending on the specific instruction in your edition, you usually need to write out the sentences and determine the of the word "олени" (deer). В заповедниках живут олени. Look for the preposition "об"

For animate nouns like "deer," the Accusative case ( feeding whom? ) looks like the Genitive. Always check if the noun is the direct object of a verb to identify it as Accusative.