pesänsä

Pesänsä is a Finnish morphological form meaning “its nest” or “his/her nest.” It is not a separate lexical item but a possessive construction formed from pesä (nest) in the genitive singular pesän, followed by the third-person possessive suffix sä, producing pesänsä. The suffix -nsä (represented here as sä) marks ownership by a third-person singular possessor, and the whole form attaches to the genitive stem rather than to the nominative.

In use, pesänsä refers to a nest or home that belongs to someone or something mentioned earlier in the text. It is a standard way in Finnish to express ownership without repeating a pronoun. For example: Kissa vartioi pesänsä. (The cat guards its nest.) Lintu korjaa pesänsä ennen talvea. (The bird repairs its nest before winter.)

Notes on structure and context: pesänsä illustrates Finnish possessive suffixing, a component of the broader genitive-possessive system. The form is common with nouns that can have a literal nest or a figurative “home,” and it can be used with a wide range of third-person singular possessors. See also possessive suffixes and the genitive case for related grammatical background.