Answer: a moose charges at him at full speed.
Explanation:
I checked my answer on the web and this is what I found (I've read this book in my lower grades)
In Chapter 16, Brian hunts a foolbird near the lake. When he gets his kill, he goes to the lake to rinse the blood from his hands. As he is doing this, a moose, a large North American animal with antlers, charges and attacks him twice.
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