Animal possessive adjectives (-ий, -ья)

Exploring the Nature Reserve

Before we start tracking wildlife, let's get familiar with our surroundings. We will be spending time in a nature reserve (заповедник).

Inside the nature reserve we found a lake.
Внутри заповедника мы нашли озеро.

Animal Possessive Adjectives

To talk about animal tracks, anatomy, and behaviors, Russian uses special possessive adjectives. While standard adjectives describe qualities (like "big" or "grey"), possessive adjectives tell us whose something is (like "bear's" or "bird's").

For animals, these adjectives have a unique set of endings in the Nominative case:

  • Masculine: -ий (e.g., медвежий — bear's)
  • Feminine: -ья (e.g., медвежья)
  • Neuter: -ье (e.g., медвежье)
  • Plural: -ьи (e.g., медвежьи)

These adjectives can be formed from almost any animal. Common examples include собачий (dog's), кошачий (cat's), волчий (wolf's), птичий (bird's), and заячий (hare's).

This is not a wolf's, but a dog's track.
Это не волчий, а собачий след.

Declining Animal Possessives

When these possessive adjectives change cases, they follow a special pattern. In almost all forms other than the Nominative (and inanimate Accusative), a soft sign (ь) appears before the ending. This soft sign separates the preceding soft consonant from the ending's vowel.

CaseMasculine / NeuterFemininePlural
Nominative-ий / -ье-ья-ьи
Genitive-ьего-ьей-ьих
Dative-ьему-ьей-ьим
Accusative(like Nom or Gen) / -ье-ью(like Nom or Gen)
Instrumental-ьим-ьей-ьими
Prepositional-ьем-ьей-ьих

Notice how the ь is preserved across these different oblique cases:

We recognized the beast by the wolf's tail.
Мы узнали зверя по волчьему хвосту.
There is not a single hare track on the snow.
На снегу ни одного заячьего следа.