746 
THE WILSON JOURNAL OF ORNITHOLOGY • Vol 124, No. 4. December 2012 
V,^eL MeaS “ remen,S ° f COZUn,el Vir “ n “ ,S ^ ' S8S Wi ' h elovely related species la Ure 
Parameter 
Species 
Cozumel Vireo. V. bairdp 
Bottom nest height (cm) 
Top nest height (cm) 
Nest tree height (cm) 
Front external nest 
depth (mm) 
Back external nest 
depth (mm) 
Front internal nest 
depth (mm) 
Back internal nest 
depth (mm) 
Widest internal 
diameter (mm) 
Narrowest internal 
diameter (mm) 
Widest external 
diameter (mm) 
Narrowest external 
diameter (mm) 
Internal opening 
circumference (mm) 
Horizontal distance to 
stem (cm) 
Angled distance to 
stem (cm) 
Clutch size 
Egg length (mm) 
Egg width (mm) 
Nesting period 
Incubation period (days) 
Nestling period (days) 
Adult mass (g)- s 
h ‘ This study. 
Figueroa and Albancse (20()3i „ — i ... . 
SSB#, 
f " ~ - eggs. " = 2 nests - D. n |q nests for dimensions, 
■ SErssrs •“ m 
Nesi #1 
Nest #2 
Nesi #3 
Mangrove Vireo. 
V. pollens* 
San -Andres Vireo. 
V. caribaeuf 
Thick-hilled Vina 
V. cmainalns' 
162.0 
114.0 
124.5 
155.0 
163.5 
100 
124 ± 49 
91-122 
268.0 
237.0 
201.5 
260 + 138 
53.0 
69.6 
65.3 
68.7 C 
60. 70 
63.5 
76.4 
62.0 
64.4 
75.6 d 
44.0 
44.5 
38.0 
37. F 
45. 40 
38.1 
54.0 
39.0 
40.5 
50.2“ 
47.5 
60.3 
55.4 
50.1 
50. 40 
57.2 
44.3 
45.7 
55.3 
33.1 
40, 35 
66.3 
70.5 
68 1 
60, 60 
76.2 
65.4 
50.0 
65.8 
50. 50 
144.5 
152.0 
151.0 
13.1 
30.0 
0.8 
140.0 
90 ± 113 
44.0 
1.3 
3 
20.2 
>2 
2 
3 
2 ± 1 
2-3 
14.4 
17.6 
19, 18 
19.2 ± 0.3 
May-Jul 
14 
13.8 
May-Jun 
12.5, 13 
Jan-Jun 
14.5 ± 0.7 
Mar-Jul 
11-12 
17 
11.2-14.6 
8.9-13 
9 
8.6-10 
11-16.2 
" 10 nCSlS forclulch si “ ; Barl <'* «nd Nash < 1985). individual measurements. 
366 cm); Maynard (1893:96). n = 4 eggs. 
We collected ,wo nests after the chicks fl 
We deposited nest #1 and its remaining esc 
National Collection ol Birds (Inst,l,node ft! 
de ia Cm vers,dad National Autdnoma dc M 
CNA V: N029I40). an 
ln the „ Museo do Zoolog,'a of HI Colegic 
Fiontera Sur, Cheiumal, Mexico 
Description of Eggs, Hatching Success 
nest'#] 5 .T CeW ~ Clutch size «hrec eg 
,“* i ' ' wo e *f in neat #2. and two 
#3. All observed eggs ( n = 6 ) were o 
short oval in shape (Baicich and Harrison 1997) 
and had white ground color with reddish-brown 
Hecks concentrated toward the broad end 
(Eig. IB). The egg we collected measured 20.2 
x 14 4 mro (length x width). 
Hatching success varied. Two of three eggs in nest 
hatchcd ’ eggs in nest #2 hatched; and neither 
c g^ in nest #3 hatched, likely because the parents 
abandoned the nest prior to completion of incubation. 
uients at two of the three nests appeared to 
lave edged young. We inferred fledging success 
