A very long period of isolation must have been required to produce the differences so manifestly to be observed, but a few forms seem at rare intervals to have immigrated, and this immigration would appear to be kept up to our own day, as shown by the instance of Zosterops lateralis, which is said to have lately made its first appearance, and to have established itself in the country, as well as by the fact of two cuckoos, Charadriiformes 650 (incl.
The avifauna resembles that of Madagascar; there are species of a peculiar genus of caterpillar shrikes (Campephagidae), as well as of the genera Pratincola, Hypsipetes, Phedina, Tchitrea, Zosterops, Foudia, Collocalia and Coracopsis, and peculiar forms of doves and parakeets.
They are considered to have their nearest allies in the Meliphagidae (see Honey-Eater) and the members of the genus Zosterops; 1 Certainly since 1826 (cf.
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