Wallace's Hawk-Eagle? Juvenile & Adult? Sarawak, Malaysian Borneo (1 Viewer)

[dixonlau]

Location: Sibu (lowland), Sarawak, Malaysian Borneo
Date: 24-Oct-2021

Are this two same Wallace's Hawk-Eagle? Not sure if Bird #1 is juvenile/immature.

Bird #1 - Is this Juvenile? The plumage looks not so dark and the eyes not so yellow compare to Bird #2.

To show the legs

Bird #2 - The eyes are yellow. The legs also visible.

Nisaetus nanus or Spizaetus nanus? On ebird.org, scientific name written as Nisaetus nanus (https://ebird.org/species/walhae1) but on Phillipps Field Guide (Wallace's Hawk Eagle at Phillipps Field Guide by PHILLIPPS, Field Guide - Borneo Bird Images), it is written as Spizaetus nanus.



Thanks.

 

[Grahame Walbridge]

The adult is a Wallace's HE for sure, but separation of juvenile Wallace's from Blyth's is not so straightforward though, there are subtle differences in tail pattern which, may be just visible in the 2nd image. There appears to be a thickish, dark tip indicating Wallace's which is the more likely at this elevation.

Family name is now Nisaetus (replacing Spizaetus) for Hawk Eagles.

Grahame

 

[dixonlau]

The adult is a Wallace's HE for sure, but separation of juvenile Wallace's from Blyth's is not so straightforward though, there are subtle differences in tail pattern which, may be just visible in the 2nd image. There appears to be a thickish, dark tip indicating Wallace's which is the more likely at this elevation.

Family name is now Nisaetus (replacing Spizaetus) for Hawk Eagles.

Grahame

Thank you so much @Grahame Walbridge . Appreciated the help.

 

[James Eaton]

On the tail pattern, for me it's the buff, not grey, tinged white band which indicates Wallace's.

James

 

[Grahame Walbridge]

On the tail pattern, for me it's the buff, not grey, tinged white band which indicates Wallace's.

James

Thanks for the clarification James, the subtle difference can be seen here Blyth’s Hawk-Eagle

Grahame

 

[James Eaton]

Thanks for the clarification James, the subtle difference can be seen here Blyth’s Hawk-Eagle

Grahame

Indeed Grahame - it's a feature I hadn't read up on before until some desktop research I did last year and realised it could be the one reliable feature. Nice when that works out!