noun
home range
Biology term for the area an animal normally lives and travels in; not used for human daily activity range in everyday speech.
このクマの行動圏は約50平方キロメートルです。
This bear's home range is about 50 square kilometers.
縄張り is a territory that an animal defends, while 行動圏 is the broader area it uses without necessarily defending it.
Compound of 行動 (action, behavior) and 圏 (sphere, range). The exact historical derivation is uncertain; the term is used in modern biology.