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游离缺失者，末端为前磨牙支持条件差，应设计卡环种类是
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Have you ever noticed that while it"s pretty easy to tell your dog is sick， it"s much harder to know how your cat or bird are feeling？ Welt， before you start asking your dog why it can"t be more 26 like animals half its size， it"s probably worth 27 each animal"s place in the food chain. You see， the lower down the food chain you are， the more important it is for you to hide any sign of illness. Obvious illness or pain28 as red flags for predators. You may as well wear a sign saying， "Easy meal， guys. Come and get me."
Now， even small dogs are 29 programmed to function like predators，which 30 considering they are close relatives of wolves. And birds——you can probably 31 why the only way you"d find out your bird is sick is when it dies.
The situation with cats，32 dogs and birds， is much more interesting. On the one hand， cats are predators， but on the other， they"re small enough to be prey.
So how can you tell if your smaller pets need 33 attention？ For one thing，trust your feelings. No one knows your pets like you do， so if you notice even very 34 changes in habits and behavior， you may want to have a vet look them over. For a cat， other signs of illness might be that it has stopped grooming， is losing weight，35more or less than usual， or missing the litter box.
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There is an effect that not only have we all witnessed， but have26. Haven"t we all been on an elevator and noticed that just about everyone stops talking when they get on？ Why do we do that？ You can be having a 27 pleasant conversation with someone， and as soon as you get on an elevator， you just feel like you"d better shut up.
Then， as soon as the doors open， everyone28conversation. Primatologists， or people who study primate （灵长类动物） behavior， have a term for this. It"s called the "elevator effect，" though it doesn"t 29 only on elevators. It happens whenever a group of primates， like humans， is 30 a situation where escape is 31 impossible. It"s thought to be a kind of safety32: as long as nobody talks， nobody is going to risk getting in a fight when there"s no way to spread out. The elevator effect keeps a lid on potential problems before they start.
Even though they rarely if ever ride elevators， chimpanzees demonstrate the elevator effect as well. When chimps are temporarily crowded together into small areas， they will 33 their vocal communication， that is， nobody speaks， and avoid eye 34. The amount of scratching the chimps do， however， goes up. Since scratching is a sign of stress in chimps， we can imagine what they are feeling. It"s just like what we feel in a crowded elevator——everybody carefully35 the lighted numbers and no one saying a thing.
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