Numerical Data on African Birds' Behaviour at the Nest.-II. Psalidoprocne Holomelena Massaica Neum., the Roughwing Bank-Martin.

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1940
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Psalidoprocne holomelmna makes a pad of beard lichen (U snea) on a ledge or in a narrow natural hole at any depth up to about 2 feet. The numerical data are derived from 800 hours' observations at Amani divided between seven nests. There is no proof that both members of a pair share brooding or feeding duty. The incubation period is 19 days, the fledging 24-27. The extent to which the eggs were incubated varied from 31 to 66 percent., apparently without relation to temperature. The frequency curves of duration of spells on eggs, and of intervals when the eggs were uncovered, contrast strikingly with those of Hirundo smithii. In Psalidoprocne both spells and intervals are much longer, most of the being between 8 and 20 minutes. Absences exceeding 30 minutes 30 minutes are rare, but 84 minutes has been recorded.
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The Ibis, p. 234-248