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WEIGHTS OF ROBINS.–PART 1. NESTLINGS
Author(s) -
Lees John
Publication year - 1949
Publication title -
ibis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.933
H-Index - 80
eISSN - 1474-919X
pISSN - 0019-1019
DOI - 10.1111/j.1474-919x.1949.tb02238.x
Subject(s) - fledge , hatching , nest (protein structural motif) , biology , shire , incubation , body weight , zoology , seasonal breeder , ecology , geography , biochemistry , archaeology , endocrinology
Summary.1 Broods of nestling Robins were weighed at Avoch, Ross‐shire, in 1946 and 1947. 2 The average weight of eggs near hatching was 2–41 grams and of new‐born chicks 1 ′72 grams. 3 Nestlings increased steadily to 17‐8 grams at day 10, with small increases or decreases thereafter till fledging at days 12–15. 4 Irregularities and lateness in reaching normal weight are considered to be due to bad weather affecting food supply in North Scotland in 1946 and 1947. 5 Late‐season broods fledged at higher weight per nestling than early broods. 6 Broods of four and five young had the highest average weight per nestling. 7 A few observations were made of the behaviour of parents in regard to incubation, nest routes, food, and the attempted removal of rings.