《Table 1 Cuckoo nestling development characteristics, recorded at 3-day intervals》

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《Development and behavior of Plaintive Cuckoo(Cacomantis merulinus) nestlings and their Common Tailorbird(Orthotomus sutorius) hosts》

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Development of characteristic traits of cuckoo nestlings is described in detail in Table 1，and photos visualizing the development of both tailorbird and cuckoo are presented in Fig.2.The Plaintive Cuckoo，being altricial，hatches naked and blind after 13.0 days（SD±0.5，n=5）of incubation，earlier than tailorbird nestlings，which hatch after 13.7 days（SD±0.7，n=11）（Wang unpublished data） .At hatching，the cuckoos had the same skincolor as host nestlings:pinkish with a pale yellow color on extremities，but the cuckoos were marginally larger and heavier[cuckoo hatchlings:1.15±0.06，n=8；tailorbird hatchlings:0.79±0.06，n=6（Weight±SD in g）]and had a bit more robust body shape with a concave rump.Cuckoo nestlings gained weight faster than tailorbird nestlings（Fig.3），and the growth patterns followed a sigmoidal growth curve.