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juvenile Common Black Hawk? (1 Viewer)
- Thread starter 49bentley
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Andy Adcock
Worst person on Birdforum
If it is Chris and it could be, although many don't split it, the birds on the Pacific Coast are sometimes treated as a separate species, Mangrove Black Hawk.
Look at the range in the book and they have a very coastal bias.
A
Look at the range in the book and they have a very coastal bias.
A
Andy Adcock
Worst person on Birdforum
I'm sorry to say the status of "Mangrove Black Hawk" was recently reviewed and it is now considered a mere subspecies of Common Black Hawk, with a much more restricted geographical range than previously thought (only northern Pacif coast of South America, from Colombia to Peru. So, Central-american birds, including those from Costa Rica, are now considered to belong to only one subspecies, nominate anthracinus, both along Carribean and Pacific coasts.
See at this address:
http://www.globalraptors.org/grin/researchers/uploads/155/manbhbullboc.pdf
This argument has just been discussed in the Forum, here:
https://www.birdforum.net/showthread.php?t=148521&highlight=mangrove+black+hawk
HBW Alive has adopted this solution, just like many other recent bibliographical references, including f.e. last year book "Raptors of Mexico and Central America".
Thanks and greetings,
Igor Festari, Italy
See at this address:
http://www.globalraptors.org/grin/researchers/uploads/155/manbhbullboc.pdf
This argument has just been discussed in the Forum, here:
https://www.birdforum.net/showthread.php?t=148521&highlight=mangrove+black+hawk
HBW Alive has adopted this solution, just like many other recent bibliographical references, including f.e. last year book "Raptors of Mexico and Central America".
Thanks and greetings,
Igor Festari, Italy
Andy Adcock
Worst person on Birdforum
I've checked some of my fieldguides and so far, have not found one that splits it as a full species anyway ( a very quick check) so it's not really a new attitude. subtillis is mentioned as a distinctive race, in some books but by no means all and it says ' often has a rufous wash on the feathers'.
A
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The handbook "Raptors of the World" by Christie and Ferguson-Lees, considered the most important single reference for the birds of prey of the world, treated Mangrove Balck Hawk (B. subtilis) as a separate species, with a map illustrating its range expanding all along pacific coast from Peru in the south to S Mexico in the north... You can read the species account in the Google Books review of that title.
And this is only one example, even if I agree with you the subtilis form has been treated as a subspecies of anthracinus much more often than a different species, but always with wider geaographical range than recently proved!
Ciao, Igor Festari
Italy
And this is only one example, even if I agree with you the subtilis form has been treated as a subspecies of anthracinus much more often than a different species, but always with wider geaographical range than recently proved!
Ciao, Igor Festari
Italy
Valéry Schollaert
Respect animals, don't eat or wear their body or s
I agree with him, the two "forms" were totally un-identifiable in Panama and Costa Rica at least, which can be acceptable for sub-species but definitely not for separate species.
Andy Adcock
Worst person on Birdforum
Well that makes perfect sense as the range limits of subtilis have been reset, it doesn't occur in Costa Rica or Panama or Venezuela where I've looked for it in the past.
It doesn't mean that they're indistinguishable, it means we were all looking in the wrong place!
A
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