1921 .] Bird-Migration by the Marking Method. 503 
of native birds from the winter visitors and birds of 
passage. 
The data available as the result of this inquiry fall under 
the following heads :—Birds marked as nestlings, birds 
caught and marked in summer, birds caught and marked in 
winter, and birds caught and marked on migration at light¬ 
houses. The first two categories consist of obviously native 
birds, the third of a mixture of native birds and winter 
visitors, as will be seen, and the fourth either of a similar 
mixture or entirely of winter visitors and birds of passage. 
The four groups have accordingly been analysed separately, 
the first two being afterwards discussed in conjunction. 
TABLE XYI. 
Numbers of Starlings Marked and Recovered. 
How marked. 
Numbers marked. 
I 
Numbers recovered 
(by categories of 
marking). 
As nestlings . 
877 
15 
Caught in summer. 
76 
7 
Caught in winter . 
732 
36 
Caught at lighthouses on 
migration . 
215 
4 
Total.1 
1,900 
62 
The percentage of birds recovered, calculated on the total, 
is thus 3*3. As the numbers of this species marked are 
relatively large, the higher proportion of reappearances 
among birds which were caught for marking, as compared 
with those marked as nestlings, is at first sight rather 
striking ; the records of the caught birds, however, are to a 
large extent due to the trapping activities of the markers at 
particular places, and the number of reappearances has thus 
become inflated. 
SER. XI.—VOL. Ill, 
2 L 
