3.1 | The composition and morphological comparison of
wintering robins
In total, 94 capture events were recorded, including 61 ringed
individuals and 33 recapture events. The wintering group was composed of
41% females (n = 20) and 59% males (n = 29). The number of 3yr+ males
with definitive blue plumage and 2yr male with intermediate blue plumage
was 2% (n = 1). Among olive-brown plumaged individuals (n =47), the
sex-ratio was slightly skewed to males with 27 female-like males and 20
females (Figure. 1).
The comparison of morphological traits between females and female-like
males showed that only S2 (p-value < 0.01) and P3 (p-value
< 0.05) in female-like males were significantly larger than in
females, while other traits, including body length, bill length, bill
crack length, tarsus length, tail length and wing length, had no
significant difference (Table 1).