| 词汇 | petrel |
| 释义 | petrel noun[ C ] uk /ˈpet.rəl/ us /ˈpet.rəl/ a bird with a curved beak that spends most of its life flying over the sea海燕 pilipenkoD/ iStock/Getty Images Plus/GettyImages Birds found by or on the sea Adélie penguin albatross booby cormorant curlew fulmar gannet gentoo penguin guillemot gull king penguin kittiwake oystercatcher penguin plover rockhopper penguin seagull shag skimmer skua Examples of petrelpetrel The protection of southern giant petrels should be increased by having a minimum distance of 50 m for all visitors. The current book is a work dedicated to three families of seabirds, namely albatrosses, petrels, and shearwaters. Therefore, the lower natural disturbance boundary was used as a reference for identifying the recommended minimum distance to southern giant petrels. During nest counts, the behaviour of southern giant petrels in terms of relevant distances to tourists was also observed. The only monitoring study on a burrowing species since cats were eradicated has been for white-chinned petrels. In 1982 the author assisted in a project on the chemical composition of blue petrel chick guano. At this time of year, prions and petrels are active. The populations of storm petrels were estimated by nocturnal calls of the birds. Four pairs of southern giant petrels in a frequently visited area of the island were compared with four in a rarely visited area. This perhaps unparalleled breadth of comparative study on petrels undertaken over 30 years is reflected in the general chapters, as important insights often come from personal experience. Cape petrels breed on one rock in the rarely visited south of the island. Skuas, snow petrels, and a solitary giant petrel enlivened the trip. Southern giant petrels moved their breeding sites to the western part of the island, which could have been caused by increased visitation. A historical background to the group is given, and we learn that the first petrels can be found in fossils aged between 40 and 45 million years old. Behavioural and heart-rate changes of southern giant petrels and skuas were investigated in detail in order to have a scientific basis for the revision of minimum distances to these species. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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