What is migratory behavior in animals?

Migratory behavior in animals refers specifically to the seasonal movement of animals from one region to another, typically driven by the search for resources such as food, better weather conditions, or suitable breeding grounds. This behavior often occurs at specific times of the year and is characterized by a return journey to the original location. Animals such as birds, fish, and some mammals exhibit this behavior as part of their life cycles to optimize survival and reproductive success.

The other choices describe different behaviors that do not fit the recognized definition of migration. Permanent relocation to new habitats may refer to colonization or habitat shift, which does not necessarily involve seasonal movement. A nomadic lifestyle is characterized by wandering without fixed patterns, lacking the predictable route that defines migration. Lastly, fixed territorial behavior involves animals establishing and defending a specific area, which contrasts the concept of movement associated with migration. Thus, the definition that encapsulates the seasonal aspect of movement for resources or breeding is accurate and aligns with the broader understanding of migratory behavior.