BIO120H1 Chapter Notes - Chapter 5: Archaea, Acclimatization, Ultraviolet
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BIO120H1 Full Course Notes
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Document Summary
Humans employ a multitude of tools to enhance our ability to gather food to meet our energy needs. We use a highly mechanized system of planting, fertilizing, and harvesting crops to feed ourselves or the livestock that we consume. For thousands of years, we have used specialized tools for hunting prey, including spears, bows and arrows, and rifles. We view our tool making capacity as something that differentiates us from other animals. However, humans are not alone in using tools to enhance their food acquisition ability. Hunt found that two types of tools were being used by the crows: hooked twig, fashioned from a shoot stripped of its leaves and bark, stepped-cut serrated edge clipped from a pandanus tree. The presence of hooks on both types of tools suggested an innovative element that might increase the birds" efficiency in extracting prey from their refuges in the trees.
