| Rich explained the low relative abundances of vultures and other raptorial groups as consistent with the pattern of relatively low representation in modern avifaunas. |
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| Secondly, reference books, for example the major avifaunas and standard works on the identification of Britain's flowers, bryophytes, moths and other beasties I may encounter. |
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| Although similar parabolic relationships were observed in two other tropical avifaunas, it may be premature to assess the generality of that relationship. |
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