A FURTHER NOTE ON HYBRID COCKATOOS. 



505 



A Further Note on Hybrid Cockatoos. 



By 

 Ernest IkVaiToii, D.Sc.Lond. 



In 1914 I described in this journal^ a case of hybridism 

 between the male of Cacatua gelerita {Lath.) and the 

 female of Licmetis n a sic a (Temm.) There are now a few 

 additional particulars to be given. 



During the last season three eggs were laid ; of these one 

 duly hatched, Avhile one was addled, and one was broken. 

 The young bird appeared quite healthy and grew rapidly, 

 but unfortunately it died when about three months old. 

 Subsequent examination suggested that the cause of death was 

 peritonitis. Mrs. Brown, who owns the cockatoos, very kindly 

 presented the bird to the Natal Museum, and it has now been 

 mounted. The growth of the bird appeared to be exceptionally 

 rapid, since at the time of death the standing length was not 

 less than in the two living hybrids. 



The time between the laying of the first egg and the com- 

 mencement of sitting varied from five to six days. In 

 the former account it was stated that probably the period of 

 incubation was about twenty-one days ; but Mrs. Brown 

 informs me that a special note had been taken of the dates of 



Hybrid. 



Date of commence- 

 ment of sitting. 



Sept. 23rd, 1910 

 Aug. 15th, 1913 

 Sept. 8th, 1914 



i 



Date of hatching, i Period. 



Oct. 20th, 1910 

 Sept. 11th, 1913 

 Oct. 4th, 1914 



27 days 

 27 „ 

 26 „ 



Approximate age 

 at Dec. 31st, 1914, 



50 months 

 15 

 3 ., 



' ' Annals of the Natal Museum,' vol. iii, pt. 1, p. 7, 1914. 



