Yellow-billed Cuckoo |

Yellow-billed Cuckoo

Notes:

~17 days from start of egg incubation to fledging

Fledges ~7-9 days from hatching

White papillae in mouth normal

Approximate Hatch Weights:

~10g at hatching

~14-15g by 2 days old

~18-19g by 3 days old

~27-30g by 5 days old

~26-29g by 6-7 days old (decrease in weight with sudden plumage development)

~32-34g by 8 days old

~38g by 9 days old

Order: Cuculiformes
Family: Cuculidae
Common Name: Cuckoos
Region: Eastern
Chick Type: Altricial
Down: Sparse white down
Skin Color: Black
Bill: Curved slightly downward and gray
Foot Type: Zygodactyl
Gape: Red with symmetrical white spots
Gape Flanges: White to pale pink
Iris: Dark brown
Legs and Feet: Light gray legs and feet

Video by Nancy Eilen

Video by Maureen Eiger

Video by Maureen Eiger

~1st Week

Photo by Maureen Eiger, Help Wild Birds

~1st Week

Photo by Maureen Eiger, Help Wild Birds

~1st Week - 13g

Photo by LouAnn Partington

~1st Week - 13g

Photo by LouAnn Partington

~1st Week

Photo by Sylvias Serpentine

~1st Week - 15g

Photo by LouAnn Partington

~1st Week - 15g

Photo by LouAnn Partington

~1st Week - 15g

Photo by LouAnn Partington

~1st Week - 15g

Photo by LouAnn Partington

~1st Week - 15g

Photo by LouAnn Partington

~1st Week - 17g

Photo by LouAnn Partington

~1st Week - 17g

Photo by LouAnn Partington

~1st Week - 23g

Photo by LouAnn Partington

~1st Week - 23g

Photo by LouAnn Partington

~1st Week - 33g

Photo by Dee Ullrich

~1st Week - 33g

Photo by Dee Ullrich

~1st Week - 33g

Photo by Dee Ullrich

~1st Week - 33g

Photo by Dee Ullrich

~1st Week - 31g

Photo by Pam Dieckart

~1st Week - 31g

Photo by Pam Dieckart

~1st Week

Photo by Sylvias Serpentine

~1st Week - 31g

Photo by Pam Dieckart

~1st Week - 27g

Photo by LouAnn Partington

~1st Week - 27g

Photo by LouAnn Partington

~1st Week

Photo by Laura Kintz, WildCare Oklahoma

~1st Week

Photo by Laura Kintz, WildCare Oklahoma

~1st Week

Photo by Laura Kintz, WildCare Oklahoma

~1st Week

Photo by Laura Kintz, WildCare Oklahoma

~1st Week - 28g

Photo by LouAnn Partington

~1st Week - 28g

Photo by LouAnn Partington

~1st Week

Photo by Dee Ullrich

~1st Week

Photo by Dee Ullrich

~1st Week

Photo by Dee Ullrich

~1st Week - 33g

Photo by Dee Ullrich

~1st Week - 33g

Photo by Dee Ullrich

~1st Week - 28g

Photo by LouAnn Partington

~1st Week - 28g

Photo by LouAnn Partington

~1st Week

Photo by Dee Ullrich

~1st Week

Photo by Dee Ullrich

~1st Week - 29g

Photo by LouAnn Partington

~1st Week

Photo by Dee Ullrich

~1st Week

Photo by Dee Ullrich

~1st Week

Photo by Dee Ullrich

~2nd Week - 33g

Photo by LouAnn Partington

~2nd Week - 43g

Photo by LouAnn Partington

~2nd Week

Photo by Maureen Eiger, Help Wild Birds

~2nd Week

Photo by Maureen Eiger, Help Wild Birds

~2nd Week

Photo by Maureen Eiger, Help Wild Birds

~3rd Week - 50g

Photo by LouAnn Partington

>3 Weeks

Photo by Maureen Eiger, Help Wild Birds

>3 Weeks

Photo by Maureen Eiger, Help Wild Birds

Posted on April 17, 2018 by Avery L. Berkowitz. Bookmark the permalink.

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Site created and maintained by Avery Berkowitz and David Grogan.

This site is made possible by the generous photo contributions of many individuals across the United States and Canada. It aims to support collaboration between those working with wildlife to accurately identify baby birds in order to provide them the best possible care.

To contribute photos to further build and expand this database, please email avery.berkowitz1@gmail.com.

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Regions

Broad Range

Eastern

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Chick Type

Altricial

Precocial

Semi-Altricial

Semi-Precocial

Down

Black and gray down with yellow early on

Black down

Brown and white down with brown eye stripes

Brown and yellow down then gray down

Brown and yellow down with brown stripe behind eye

Brown and yellow down with complete brown eyestripe

Brown and yellowish down with faint to no brown eyestripe

Brown down with white patches and underside

Brown to black down with naked top of head

Brown with pale stripe above eye

Buffy down then gray down

Buffy down with brown and black markings

Buffy down with dark brown and white markings

Buffy down with dark brown eye-stripe behind eye

Buffy down with dark brown markings

Buffy down with naked face

Dark brown down

Dark brown to black down with white underside

Dark gray down with white underside

Gray and brown down above with white down on underside

Gray down

Gray down with black and white markings

Gray down with black markings

Gray-brown down above with whitish down on underside and dark eyestripe

Light brown down

Naked

Naked then black down

Naked then gray down

Naked then gray/tan down then white down

Sparse black down

Sparse buffy down

Sparse gray down

Sparse white down

Sparse yellowish down

Very short white down with brown markings

White and buffy down with black stripes

White down

White down with brown and black markings

White down with naked face

White then gray down

White to yellowish down

Yellow down

Yellowish to brown down

Skin

Black

Blue-gray

Brown

Gray

Greenish

Orange

Orange-red

Orange-yellow

Pink

Pink to gray

Pink to orange

Pink to yellow

Pink to yellow around head and black on body

Reddish-brown

Yellow then pink and black

Yellowish

Bill

Black distally and red to orange proximally

Broad and black

Broad and black with pink then yellow

Broad and gray to black

Broad and gray to black with pale tip

Broad and gray to pink

Broad and gray with pink to yellow

Curved slightly downward and gray

Hooked and black

Hooked and blue-gray with darker tip

Hooked and gray to black

Hooked and gray to yellow-green

Hooked and gray with yellow tip

Hooked and off-white

Hooked and pink to gray

Hooked and pink to gray with pale tip

Hooked and pink to pale yellow

Long and brown to black with slight downward curve

Long and conical and pinkish to grayish

Long and gray to brown with downward curve

Long and straight and black

Long and straight and black with pale tip

Long and straight and gray to orange

Long and straight and grayish then yellow with black

Long and straight and orange to pink with dark tip

Long and straight and orange-yellow then black

Long and straight and pink then gray

Long and straight and pink to black

Long and straight and pink to orange

Long and straight and pink with black tip

Long and straight and pinkish with black band

Long and straight and yellow to orange

Long and thick with downward curve and orange to yellow

Long with downward curve and gray to pink

Long with downward curve and pink with black bands

Long with hooked tip and black

Short and black

Short and brown to black

Short and conical

Short and gray to black

Short and gray to brown

Short and pink

Short and pink to black

Short and pink to brown

Short and pink to gray

Short and yellow to gray

Straight and black

Straight and brown to black

Straight and brown-black with yellow

Straight and enlarged around nares

Straight and gray to black

Straight and gray to black with pale tip

Straight and gray to brown

Straight and gray with pink

Straight and orange to yellow

Straight and pale brown

Straight and pink to black

Straight and pink to brown

Straight and pink to gray

Straight and pink to yellow

Straight and red with yellow tip

Straight and yellow to gray

Straight and yellow with black bands

Straight and yellowish to black

Straight and yellowish to brown

Tubenose

Foot Type

Anisodactyl

Lobate

Palmate

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Totipalmate

Zygodactyl

Zygodactyl with only 3 digits

Gape Color

Gray to pink

Orange

Orange-yellow

Orange-yellow with five black spots

Pink

Pink with black and white markings

Red

Red with symmetrical white spots

Red-pink

Reddish-orange

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Yellow with two black spots on tongue

Yellowish-gray

Gape Flanges Color

Cream-colored

None

Orange-yellow

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Pink

White

White to pale pink

White to yellow

Yellow

Iris Color

Black

Black to gray

Blue to gray

Brown

Brown to light gray

Dark brown

Gray

Pale bluish then dark brown

Pale gray to yellow

Yellow

Yellow to orange

Legs and Feet

Black to brown legs and feet

Bright yellow and raptorial feet

Brown and yellow legs and feet

Brown and yellow legs/digits with black foot webbing

Brown legs and feet

Brown to olive legs and feet

Brownish to yellowish legs and feet

Dark gray legs and feet

Dark greenish to brown legs and foot webbing

Feathered legs and raptorial feet

Gray legs and foot webbing with yellowish digits

Gray legs and pink feet

Gray to black legs and feet

Gray to black or yellowish legs and feet

Gray to brown legs and feet

Gray to greenish legs and feet

Gray to greenish legs with yellowish feet

Gray-pink then black legs and feet

Green to yellow legs and feet

Light gray legs and feet

Light gray to pale yellow and raptorial feet

Orange legs and feet

Pale yellow and raptorial feet

Pale yellow to greenish legs and feet

Pink legs and feet

Pink then yellow to green legs and feet

Pink to blue-gray legs and feet

Pink to brown legs and feet

Pink to gray and raptorial legs and feet

Pink to gray legs and feet

Pink to orange legs and feet

Pink to pale yellow and raptorial feet

Pink to yellowish legs and feet

Proportionally small pink to gray legs and feet

Yellowish legs and feet

Yellowish or pink then brown legs and feet

Yellowish to black legs and feet

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