Assertion: chickadee's size | /r/HasProperty | a part of the brain
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Source sentences:
text: Pravosudov compared the size of the hippocampus of the brain (a part of the brain involved in memory) in chickadees collected in Alaska (where caching and efficiency of cache recovery is expected to be a critical factor in a bird's survival) with those of chickadees collected in Colorado (where caching and cache recovery is expected to be of less importance in survival).