Birds sing beautiful songs to attract mates during breeding season. Whales (鲸) are well known for their a 5 to communicate with complex vocal sounds. Humans don’t understand these sounds, but in their own social groups, whales understand w 6 they’re saying to each other. ...
In that program, people learnthe breeding calls of the local toads and frogs. They then reporttheir data back to a national database.If you don't know the excellent time to observe frogs, choose the early spring. It is the time fortheir annual renewal of life and they are most active ...
The female is ready to breed almost any time, and she’ll have a litter of babies about 30 days after breeding. These bipedal herbivores eat a diet of mostly green foods, but they are also opportunistic feeders that will eat seeds, fruit, and bark. They live in large groups in ...
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Among them is one nationwide frog-watching program in the US In that program, people learn the breeding calls of the local toads and frogs. They then report their data back to a national data base. If you don't know the excellent time to observe frogs, choose the early spring. It is ...
This is a warning to other animals, who soon learn to keep away from animals with these bright colours. Many birds take on different colours during the breeding(繁殖的) season to attract a mate.Some animals use smells to communicate. For example,certain animals send out chemicals (化学物质)...
are slowly recovering with help from people along the east coast. The California condor has also benefited from conservation efforts. After the last wild nine were captured, breeding programs have released 150 back into the wild, where normal breeding has brought the population to about 300. The...
These dogs have excellent health due to their breeding for coursing, working, and racing, activities that combine to provide well-rounded physical exertion. As a result, they are not prone to many of the conditions that the Greyhound and other sighthounds and purebreds have. Genetic eye defects...
The largest and strongest male that prevails over the others in a fight will usually have near-exclusive breeding rights to the nearby females in a single herd. This ensures that the best characteristics tend to be passed down from one generation to the next. Many species breed in the fall ...
In many types of birds the feathers are brightly colored in order to attract other birds. Birds lose their feathers at least once a year. They grow new ones—mostly during the breeding season.The bills or beaks of birds are built differently, depending on what they eat. Woodpeckers have a...