Jen almost has me convinced that bird #2 is a Glossy. I'd love to have a
better look at exactly what and where that loral line is, but otherwise, it
does seem good for Glossy.

Here is some pertinent info (taken from Pyle, Part II) on Glossy vs.
White-faced Ibis, which are treated there together in one account (pardon
any typos I may have missed):

"Some HYs in June-Oct may not be identifiable until development of the pale
stripes in the loral skin o fHY Glossy Ibis (in Jul-Oct) or the reddish eye
in HY White-faced Ibis (in Sep-Dec). See Figure 267, Arterburn & Grzybowski
(2003), Fall (1995), Howell & de Montes (1989), Kaufman 1990a, Patten &
Lasley (2000), and Pratt (1976, 1980) for more information."

Here's what it says about Juv, HY/SY and SY/TY birds (p372):

"Juv (B1; Jun-Aug) has head and neck pale brown, without streaks and often
with scattered white feathers or patches in head and throat, and bill
pinkish with dusky bands (Fig. 267A,C); Juv male=female. The following
month ranges pertain to N.Am populations.

HY/SY (1st cycle, F1/A1; Sep-Aug): Bill pinkish, becoming grayish by
Oct-Dec; head and neck grayish brown with whitish streaks, often mixed with
worn juv brown feathers through Jan; rects rounded and without glossy sheen
(Fig. 268A); upperparts including les and med covs uniformly greenish olive
with dull sheen (Fig. 269A), the s covs often with one to many dull
maroon-centered or semi-glossy feathers in Dec-Aug (Fig. 269B); med covs
with little or no purplish sheen (Fig. 269A); breast with no to a few dull
maroon-centered feathers in Feb-Aug; loral skin dull slate within
indistinct pale stripes in Glossy Ibis (Fig. 267A), or dusky to dull
reddish in White-faced Ibis (Fig. 267C); iris brownish in White-faced Ibis,
becoming reddish brown by Sep-Dec.

SY/TY (2nd cycle, B2-A2; Sep-Aug): Bill grayish; head and neck brown with
white streaks, variably mixed (5-95%) with maroon alternate feathers in
Feb-Aug; rects truncated and with substantial glossy purplish sheen (Fig.
268B); upperparts greenish with bluish gloss, the les covs mixed with some
dull maroon-centered feathers in Sep-Feb (Fig. 269B-C) or some to many
bright maroon feathers in Feb -Aug (Fig. 268C-D); med covs with moderate
purplish sheen (Fig. 269C); breast with 50-95% maroon feathering in
Mar-Aug; loral skin dark grayish with distinct pale lines in Glossy Ibis
(cf. Fig 267B), or dull reddish in White-faced Ibis (cf. 267D); iris
reddish in White-faced Ibis. Note: Intermediates with ASY/ATY, e.g.
individuals with full maroon bodies but les covs indicating SY/TY (Fig.
269B-C) or intermediate (Fig. 269D-E), are perhaps best aged T-4Y (see pp.
41-42) but more study is needed."

Instead of photocopying them, I'll just summarize the figures with text:
Fig 267 has Juv-HY and ASY (A and B) of Glossy and (C and D) White-faced
Ibis.
Fig 268 shows HY/SY (A) and AHY/ASY (B) outer rectrix tips.
Fig 269 shows sketches of the extent of maroon on the les and med covs on
folded wing: A) Juv; HY, Aug-Dec; B) Form./B2; SY, Jan-Dec [few flecks on
les covs]; C) B2/A2; Sy/Ty, Sep-Aug [dense flecks on les covs]; D) A2/DB;
TY, Feb-Aug; ASY/ATY Sep-Feb [dense on les covs; flecks on med covs]; etc.

-Paul

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