Divers sp. (?) (1 Viewer)

O

osprey0311

Well-known member

• Dec 12, 2014

• #1

Hello!
Help, oplease, with ID:
(Ukraine, today)

 

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Last edited: Dec 12, 2014

Andrew Whitehouse

Professor of Listening

Supporter

• Dec 12, 2014

• #2

Black-throated Divers

 

chris butterworth

aka The Person Named Above

• Dec 12, 2014

• #3

Seconded

 

O

osprey0311

Well-known member

• Dec 13, 2014

• #4

Thanks to all!!!)
How about this one? Juvenile Red-throated Diver?

 

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lou salomon

the birdonist

• Dec 13, 2014

• #5

yes, 1cy RTD.

 

Tiraya

San Diego CA

• Dec 14, 2014

• #6

For my personal interest, how is great northern separated from these pictures, especially the one in the back? (regarding the original 2 birds not the RTD)

 

Samuel Perfect

Well-known member

• Dec 14, 2014

• #7

Silverwolf said:

For my personal interest, how is great northern separated from these pictures, especially the one in the back? (regarding the original 2 birds not the RTD)

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Upper and lower culmen are more curved, leading to a point whilst GND has a more angular bill. The rear white thigh patch is also a useful indicator for BTD, whilst GND does show white flanks when sitting high in the water they don't arc upwards at the end to create a bulge of white near the rear. Neck pattern is probably my favourite separating feature. BTD shows a grey nape which darkens at the sides as it approaches the the sudden contrast to a white throat. On the other hand, juv and winter plum. GNDs have a pale wedge in the side of the darker nape. The nape is also darkest at the rear, not the sides as is the case for BTD.