Passage Summary: The author argues that finding out an animal uses tools isn't a big deal because, under a broad definition, every animal does it.

Conclusion: The announcements by biologists that certain animals can use tools are not surprising.

Reasoning: All animals use tools if a tool is defined as any external physical object used to achieve a purpose, such as birds building nests or squirrels using buildings.

Analysis: The statement in question serves as the main conclusion of the passage. The author identifies a common scientific announcement and immediately dismisses its significance, spending the rest of the text providing a definition and examples to support that dismissal. Focus strictly on the structure here: the claim is the thesis, and the subsequent sentences provide the supporting evidence.