And from heronconservation.org

LBHE

CHICK: Chicks are covered by white grey to brown grey down, with a crest of long hair like, tawny down. The down turns white within one week. Bill is pink grey at base, pink blue outward, and turning pinker in first week Chicks can be identified up close by their dusky wing tips. Iris is light grey. Skin, including leg and foot, is pink grey to grey.

BCNH

CHICK: The chick has buff brown down on its back, light down below. The outer portions of the crown down are white creating a crest. The bill is pink with dark tip. Iris is gray olive, changing to light yellow, and then bright yellow by 30 days. Lores are grey at hatching becoming grey green. Legs and feet are brown at hatching, turning yellow olive, then olive grey, and finally light green at 30 days.

On Sat, Jul 6, 2019 at 4:54 PM Rad Widmer <[log in to unmask]> wrote:
Based on leg and feet color, I lean towards bcnh.

From birds of n America 

Little blue:

Bare Parts

Breeding soft-part colors of adults and subadults (approximately 1 yr) are assumed prior to courtship period and maintained until about 7–10 d after pairing (Rodgers 1980b).

Bill And Gape

Nonbreeding bill dark grayish, distal third nearly black; breeding adult base of bill glossy turquoise cobalt, distal third black; subadult base of bill pale turquoise cobalt, bill tip black (Rodgers 1980b); hatchling upper mandible pinkish gray basally and pinkish blue distally, lower mandible mostly pinkish, egg tooth light colored and present until at least 12 d of age; mandibles noticeably more pinkish by day 5 (Mcvaugh 1972Mcvaugh 1972).

Iris

Nonbreeding pale yellow; breeding adult grayish green; subadult yellowish to whitish (Rodgers 1980b); hatchling light gray to whitish gray (Mcvaugh 1972Mcvaugh 1972).

Bare Skin On Head And Neck

Nonbreeding loral area dull greenish; breeding adult loral area glossy turquoise cobalt; subadult orbital skin pale turquoise cobalt (Rodgers 1980b).

Legs And Feet

Nonbreeding legs and feet pearl gray to grayish green; breeding adult black; subadult greenish yellow to pale gray (Rodgers 1980b); hatchling tarsus and toes pinkish gray to medium gray (Mcvaugh 1972Mcvaugh 1972Mcvaugh 1972).



BCNH:

Bill And Gape

Upper mandible light drab with grayish tip at hatching, becoming yellowish at 5–10 d, black with yellowish sides basally at 50 d, and black with greenish olive sides basally at 1 yr. It varies from grayish to blackish in second year and thereafter becomes entirely black during breeding season but regains olive green base when birds are not breeding. Lower mandible same color as upper mandible at hatching, becoming horn color at 10–50 d, yellowish with horn tip at 1 yr, and finally black by 2 yr of age.

Iris

Grayish olive at hatching, but changes to light yellow within 1–2 d, and is bright yellow by 20–30 d, orange-chrome by 1 yr, and bright red by 2–3 yr of age.

Bare Skin on Head

Loral skin gray at hatching, becoming increasingly grayish green to bluish green. In birds that breed during second calendar year, bill and lores turn black. By the next breeding season lores are yellow lime to grayish olive (black during breeding). Eyelids are azure blue during breeding, but they are black when not breeding. (See plate opposite p. 366 in Palmer 1962a.) See Gross (Gross 1923) and McVaugh (Mcvaugh 1972) for further details about soft part colors.


Legs And Feet

Tarsi and toes dull buff to brown at hatching, yellowish olive at 5 d, olive gray at 10 d, light green from 30 d to 1 yr, and yellow by 2 yrs of age. Underside of toes light cinnamon drab at hatching, green by 10 d, light yellow at 40 d, and increasingly bright yellow thereafter until 3 yr of age. Greenish legs sometimes suffused with pink in birds that breed during second calendar year. In adults, legs are pink or ruby red, a result of increased vascularization during breeding (Noble and Wurm 1940), but they are black when not breeding.



On Sat, Jul 6, 2019 at 4:32 PM Edge Wade <[log in to unmask]> wrote:
hmmm, dark and light bills in same nest?
e

----- Original Message -----
From: "Andrew Reago" <[log in to unmask]>
To: [log in to unmask]
Sent: Saturday, July 6, 2019 3:56:50 PM
Subject: Re: Can you help us identify the species of the chicks that fell out  - one more helpful photoof the nest?

Here is one more photo to help out with this ID process - or confuse
folks even more. We took a photo of some chicks at a Little Blue Heron
Nest yesterday - the parents were with them at the nest, but we got a
photo of them when the parents moved off. Compare them to the two that
I linked you to in my post. You will see why we think the chicks that
have been rescued might be Little Blue Heron young, rather than
Black-crowned Night-Heron:
 https://www.flickr.com/photos/wildreturn/48215625797/in/photostream/
[1]

Andy Reago

        -----------------------------------------From: "Andrew Reago"
To: [log in to unmask]
Cc:
Sent: Saturday July 6 2019 2:04:03PM
Subject: Can you help us identify the species of the chicks that fell
out of the nest?

  Can anyone on the list help us identify the species of the four
chicks that fell out of a tree cut down at the heron/egret rookery in
St. Louis City a few days ago. By the way, the chicks have been taken
back to Wild Bird Rehab. Trying to put them in trees did not work
since people thought these chicks were Black-crowned Night-Heron
chicks and there was no active nest that could be found.   
    However, there were plenty of Little Blue Heron nests with chicks
that looked just like them. The initial ID was based on the behavior
of Black-crowned Night-Heron adults in the area, from what we
understand, but the adults could have been agitated due to a nest with
eggs that was also destroyed in the cutting down of the trees.   
    We'd love some help getting more definitive on what kind of chicks
these are. Three of the darker-billed chicks looked just like the
photo of one I'm going to link you to, the fourth one is in the second
photo I'll link you to, with a lighter bill, but otherwise looks
pretty much the same. A number of Little Blue Heron chicks present at
the rookery had both light and dark bills, by the way. I wonder if the
way you tell is in the eyes?   
    Thanks for any help. These chicks have to be one of three species
that were in that area and in the tree that was cut down and from
which they were rescued: Little Blue Heron, Snowy Egret or
Black-crowned Night-Heron. Even though Great Egret chicks were nearby,
they were not in these trees that were cut down.   
    Three of the chicks look like this one:   

[2]https://www.flickr.com/photos/wildreturn/48215186042/in/dateposted/
[3]   
    One of the chicks looks like this - a lot like the other three,
except for the lighter bill:   

[4]https://www.flickr.com/photos/wildreturn/48215186372/in/photostream/
[5]   

    Thanks,   
    Andy Reago   
    [log in to unmask]   
    St. Louis, MO   



Links:
------
[1]
https://www.flickr.com/photos/wildreturn/48215625797/in/photostream/
[2]
https://www.flickr.com/photos/wildreturn/48215186042/in/dateposted/
[3]
https://www.flickr.com/photos/wildreturn/48215186042/in/dateposted/
[4]
https://www.flickr.com/photos/wildreturn/48215186372/in/photostream/
[5]
https://www.flickr.com/photos/wildreturn/48215186372/in/photostream/


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The Audubon Society of Missouri's Wild Bird Discussion Forum
List archives: https://po.missouri.edu/archives/mobirds-l.html
ABA Birding Code of Ethics
http://www.aba.org/about/ethics.html


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