FOURTH SEASON (1921) : FOSTERERS 109 
breeding-ground was thus ruined for the season. 
A fatality had overcome No. 3 pair before the 
Cuckoo began to lay, and so there were only five 
pairs to serve her requirements. I am not giving 
the same detailed account as before, as that will 
have well served to explain our methods. The 
following is a summary of the domestic history of 
the Meadow Pipits in residence this year. The 
territories are shown on the plan at the end of 
Chapter VIII, p. 150. 
No. 3 pair had one nest before the Cuckoo began 
to lay, and then disappeared. Eventually the 
cock was found dead on that pair’s breeding 
territory. 
No. 4 pair had its first nest too soon for the Cuckoo. 
Its second nest, built on No. 1 vacant territory, 
received the Cuckoo’s second egg, which was 
the first occasion on which the Cuckoo was 
filmed, and the Cuckoo’s seventh egg was 
placed in the third nest of this pair. Then the 
male deserted his own mate and paired with the 
female of No. 3 pair. The combined pair had 
three more nests, the Cuckoo using the first 
two for her tenth and fifteenth eggs, whilst 
the third and last duly contained and brought 
up a brood of four young. 
When the female of No. 3 pair mated with 
