Which of the following would NOT be a focus of an ethogram?

An ethogram is a comprehensive catalog or inventory of behaviors exhibited by a particular species, often documented through careful observation. It typically focuses on a range of behaviors that are observable over specific timeframes, aiming to capture the nuances of how an animal interacts with its environment and peers.

The selection highlights that "A single behavior of a species over its lifespan" would not be a focus of an ethogram. An ethogram emphasizes documenting various discrete behaviors in context, rather than concentrating on a single behavior over the entire lifespan of the species. The goal is to provide a broad overview of multiple behaviors under different circumstances rather than a detailed analysis of one particular behavior's longevity or variations.

The other options are indeed central to the purpose of an ethogram. Cataloging all social interactions or observing specific behaviors during set observation times aligns perfectly with an ethogram's function, as does documenting the timing and frequency of behaviors throughout the day to understand patterns and rhythms in animal activity. Each of these focuses contributes to forming a comprehensive understanding of a species' behavioral repertoire, unlike the narrower scope that a single behavior would provide.