注释:
1. The Shannon Dolphin and Wildlife Foundation (SDWF): 香农海豚与野生生物基金会。
2. the Shannon River：香农河[ 位于爱尔兰共和国的中西部]
3. cow shed: 牛棚
4. those 指代前半句的 whistles。
5. Ronan Hickey…separated them into six fundamental whistle types and 32 different categories： Ronan Hickey 将啸声划分为6大类32种
6. most = most categories
7. both sets of dolphins 是指 the Irish dolphins 和 the Welsh dolphins。
8. References in local legend:：当地传说中的有关说法
9. they may even have been resident there as far back as the 6th century：海豚可能早在公元 6 世纪就在香农河河口繁衍生息，resident 是形容词，意思是 “居住的”。
练习：
1. The difference in eating habits between the bottle-nose dolphins and the sperm whales interested the SDWF scientists.
A. Right B. Wrong C. Not mentioned
2. Ronan Hickey analyzed almost 2000 different dialects of the bottle-nose dolphins.
A. Right B. Wrong C. Not mentioned
3. Of the 32 categories, eight were produced only by the Irish dolphins.
A. Right B. Wrong C. Not mentioned
4. Whistles could also be used to communicate between adult dolphins and baby dolphins.
A. Right B. Wrong C. Not mentioned
5. Sperm whales can produce stronger ultrasonic waves to kill their prey than dolphins.
A. Right B. Wrong C. Not mentioned
6. As early as the 6th century, Irish fishermen started raising dolphins in the Shannon estuary.
A. Right B. Wrong C. Not mentioned
7. Irish dolphins attract tourists and over 25,000 people come to see them every year.
A. Right B. Wrong C. Not mentioned
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