Island Frigatebirds (Stonehouse, Ibis lOJb, p. 476, 1963 ) are presented 
in the same table for comparison. 
Comparisons of the Egg dimensions of Three Species of Frigatebirds* 
Lesser Frigatebird : Fregata ariel 
Great Frigatebird : Fregata minor 
Ascension Island Frigatebird : Fregata aquila 
Length - Diameter 
ariel 
minor 
aquila , 
ariel 
minor 
aquila 
Maximum 
• 67.0 
72.4 
74.5 
45.7 
48.2 
49.4 
Minimum 
52.5 
62.9 
59.7 
39.1 
45.4 
43.0 
Kean 
60.4 
67.3 
67.8 
41.6 
46.5 
47.1 
Number in 
Sample 
64 
21 
96 
64 
21 
96 
* Egg measurements on Greater and Lesser Frigatebirds were read to 
the nearest tenth of a millimeter on a direct reading dial caliper. 
