FOURTH SEASON (1921) : FOSTERERS 111 
No. 7 pair had four nests. The first three were 
not used by the Cuckoo although she visited 
the third nest several times. The fourth she 
used for her eleventh egg, the act of laying 
being photographed by Miss E. L. Turner, 
and the same nest was used by another Cuckoo 
(almost certainly the E bird of 1919 — see p. 32) 
sixteen days later, the day before the Pipits 
actually hatched a brood from substituted 
eggs in this fourth nest. 
No. 9 pair had four nests, the first before the 
Cuckoo returned. The second nest received 
the Cuckoo's third egg (also filmed) ; the 
third the Cuckoo’s eighth egg ; and the fourth 
the Cuckoo’s twelfth egg. The laying of this 
egg was excellently filmed. This pair did not 
build again. 
