Well that wouldn't be correct English, as you have to use articles, i.e "a/an" or "the".
One exception is plurals, i.e "Snakes eat mice."
The only other exception I can think of is when writing titles / newspaper headlines, you might read "Snake eats man!" as a headline for example.
Oh, it is in the Accusative. Here is how different nouns behave in the Accusative:
- -а(-я)-nouns: always -у(-ю), e.g., маму, воду
- neuter nouns: no change, e.g., молоко, животное, яйцо
- inanimate consonant-ending masc. nouns: no change, e.g., хлеб, стул, нож, компьютер
- animate consonant-ending masc. nouns: copy the Genitive, e.g., брата, отца, актёра, учителя
- -ь-ending feminine nouns: no change, e.g., ночь, мышь, тень, рысь
- plural nouns: like the masculine above (i.e. Nominative/Genitive plural depending on animacy)
(if you are curious about имя and время-type neuter nouns, their Accusative is the same as their Nominative)