32 
THE CUCKOO’S SECRET 
not parasitic upon Meadow Pipits and so were not 
within the scope of our investigation. 
Initial letter Date found and State of 
of Cuckoo. Fosterer. number in clutch. incubation. 
C Hedge-Sparrow 3+C May 28 Fresh 
D Pied Wagtail 4-j-D 1 June 13 Two days 
E Tree Pipit 4+E ,, 22 One day 
The eggs of these three Cuckoos are different from 
one another and utterly unlike those of Cuckoos 
A and B. Another egg of D, in a Pied Wagtail’s* 
nest, 1 +D 1 , was found on June i some half a mile 
distant. A Cuckoo tending to dupe this Wagtail 
must of course, from the comparative infrequency 
of nests, range over a wide territory if she is to lay 
a large number of eggs in a season. 
* Motacilla lugubris. 
