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David Lack 1973Evolution, 27(2)[1) The number of species of hummingbirds on each West Indian island is correlated with altitude, mainly because montane humid forest brings in an additional species. 2) Each species differs markedly in habitat, feeding stations or size from the[...]
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David Lack 1964-07Nature, 203(4940)WYNNE-EDWARDS1 has so misunderstood the problem of clutch-size in the swift Apus apus at Oxford reported by Perrins2 that further clarification seems desirable. First, he confused clutch-size (number of eggs laid) with brood-size (number of youn[...]
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David Lack 1963-10-01Ibis, 105(4)Arrivals of gulls S.W. seem almost confined to late July. In August, the main movements are W. by day and night of Lapwings and S.S.E. by night of warblers. Sand Martins migrated at dawn directly from a large roost at 34 m.p.h. In midwinter, mig[...]
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David Lack 1963-01-01Ibis, 105(1)Summary. 1 In autumn in Norfolk, the main nocturnal departures are (i) S.S.E., especially in September, of British summer residents; (ii) E., of unknown species; (iii, iv) S.S.W. and W., chiefly in October, the onward passage of birds, mainly th[...]
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David Lack 1959-04-01Ibis, 101(2)Summary. 1 Migration across the North Sea off Norfolk is reviewed over three years on the basis of the detection of bird echoes by radar. 2 Large movements are most frequent in March, April and November and least frequent in December and January[...]
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David Lack 1958-10-01Ibis, 100(4)1. The return in spring and departure in autumn of resident Swifts was studied in six years, primarily by means of a nightly check of roosting birds. 2. The mean date of return in spring has varied by nine days in different years. The return was[...]
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David Lack 1958-04-01Ibis, 100(2)1. In the Turdinae, colour of eggs is valueless as a guide to classification, since not infrequently a species has eggs that are unlike those of its congeners and like those of a species in a different genus. 2. Instead, certain colours of eggs [...]
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David Lack ; John Gibb ; D. F. Owen 1957-06-01Proceedings of the Zoological Society of London, 128(3)1 In most years the mean weight of nestling Great and Blue Tits was lower in larger than smaller broods, but it was similar in 1948, when food was exceptionally abundant. 2 In most years, the commonest clutch of the Great Tit was nine or ten, an[...]
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David Lack 1956-10-01Ibis, 98(4)Summary. 1 The period when Swifts have young in the nest probably corresponds, in general, with the season when their food is most abundant. 2 The start of the clutch may be held up by bad weather, which influences laying five days later. 3 The [...]
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David Lack 1956-01-01Ibis, 98(1)Summary. 1 The correct determination of the species of Apus is difficult. Their extreme adaptation to aerial life allows for few trivial or incidental differences. Some species look much alike and some conspecific races look very unlike. In seve[...]
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David Lack ; D. F. Owen 1955Journal of Animal Ecology, 24(1)1. Swifts feed on air-borne insects, but take more varied foods than those in the true aeroplankton, since they often feed close to the ground, to trees or to open water. 2. They seek out places where air-borne insects are abundant; this varies [...]
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David Lack 03/1954Bird Study, 1(1)I. In a 9-year census of singing male Robins (Erithacus rubecula) near Oxford,, the number varied from 26 to 72. Numbers fell after hard winters, but the other variations were not explained.
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