Most animals use sound as a form of communication and with it are able to express many different things. It is often a key factor in survival and in many cases, if an organism cannot communicate properly or well enough, they may not survive. In some gull species, there are certain sounds used for specific needs, such as finding a mate, locating food, or claiming territory. These sounds are also often used in different scenarios based on the time of year. Sounds used to find a mate for example, are later used to communicate with that mate when caring for the young and finding food. The sounds are versatile and have different meanings based on the context. The sounds of birds is recorded and analyzed for different measurements when studied. The band width of sound can be measured by subtracting the lower frequency from the higher frequency. There is a bigger difference between the high and low frequencies in wide bandwidths and a smaller difference in short bandwidths. The trill rate is how often a sound is made, or how quickly. The trill is known as a high performance form of communication, because it requires a lot of energy. There is a trade off between these two sounds because one cannot have a wide bandwidth as well a high trill rate, the bird is incapable of doing both really well at the same time. A higher or faster trill rate is accompanied by a short bandwidth because it is too difficult to have a wide bandwidth and fast trill rate.
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