Most groups of plants and animals are richer in species and more plentiful near the equator．In the ocean，that holds true for cold-blooded predators．But warm-blooded predators are more diverse toward the poles and noticeably missing from several warm hot spots．Why？
    John Grady，an ecologist，and his team considered the possibility-warm-blooded animals need a lot to fuel their metabolism（新陳代謝）．Perhaps colder waters are just richer in small fish？But they found that at higher，colder places，there isn't actually much more food around．It's more that warm-blooded animals are eating a much bigger share of it than their cold-blooded competitors．
    The real explanation is simple．An animal's speed，swiftness，and intelligence depend on its metabolism，which in turn depends on its temperature．Since birds and mammals can keep heating their bodies in icy conditions，they remain fast and attentive．By contrast，the fish they hunt become slower and duller．At some tipping point of temperature，seals，dolphins，and penguins start out swimming their prey．They become more likely to come upon targets and outpace the cold-blooded predators of their own．
    In Grady's words，"Warm-blooded predators are favoured where preys are slow，stupid and cold．" That's why sharks and other predatory fish dominate near the equator，but colder waters are the kingdom of whales and seals．By keeping food to themselves in the poles，these creatures can then specialize on specific types of prey，which makes them more likely to split into separate species．The killer whales of the North Pacific，for example，include mammal eating transients and fish-eating，year-round residents．
    But the world is changing It's likely that the surface of the oceans will warn by 2 to 3 C within this century．Grady's team estimates that every time the ocean's surface wars by 1℃，populations of sea mammals will fall by 12%，and populations of seals and sea lions will fall by 21%．
    But "predictions are hard"．Donna Hauser from the University of Alaska Fairbanks notes．"Polar bears are losers of a warming world，but some populations are still doing well．Some groups of whales have changed the timing of their migrations；others are hunting in deeper，colder waters．These changes might make sea mammals more adaptable to changing climates．Maybe they just need to find the places where fish remain slow，stupid and cold．"

Phenomenon	Around the equator．species of plants and animals are comparatively more richer，which is also true （1） of of the cold-blooded predators．However，in both poles diverse （2） kinds/sorts kinds/sorts of warm blooded species can be found．
Research of John Grady's team	They thought cold waters had more small fish to provide for warm-blooded animals． （3） which which is not the fact．It's possible that warm blooded predators are more （4） competitive competitive in hunting for food．
Explanation and some experts' opinion	An animal's speed，swiftness and intelligence are ultimately （5） effected/influenced/impacted effected/influenced/impacted by its temperature． （6） Different Different from cold-blooded animals，warm-blooded animals body temperature is kept in a certain range even in icy conditions． In colder waters（7） where where preys such as small fish are slow and stupid，warm blooded such as whales and seals get more （8） advantage（s） advantage（s） ．
Conclusion	The world is changing．With the temperature of the oceans （9） rising rising ，the populations of warm-blooded animals may be falling．However，some species have set good examples in （10） adapting adapting to the changing climates．