...most fascinating is the way in which the different loon species, all of which are aggressively territorial and have similar food and nesting site requirements, have evolved differences in flying ability that apparently enable them to breed in close...
...it hard for shell-making marine animals to make shells, including forms of plankton on which Alaska salmon feed. Similar food-web effects will attend other commercially valuable species. If their food source grows scarcer, so will they...
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