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Soortgroepen => Wat is dit voor vogel? / Determinatie => Vogels => Hybriden => Topic gestart door: laatvlieger op oktober 16, 2007, 21:33:52 PM

Titel: hybride A. erythropus x A. canagicus?
Bericht door: laatvlieger op oktober 16, 2007, 21:33:52 PM
http://waarneming.nl/wn_details.php?id=3077744 (http://waarneming.nl/wn_details.php?id=3077744)
Titel: hybride A. erythropus x A. canagicus?
Bericht door: laatvlieger op oktober 17, 2007, 09:59:17 AM
De donkere onderstaartdekveren verraden keizergans invloeden. De bredewitte kol, die ver over de kruin doorloopt en de gele oogring hinten naar dwerggans.  
Titel: hybride A. erythropus x A. canagicus?
Bericht door: Alcedo atthis op oktober 17, 2007, 10:48:22 AM
CiteerDe donkere onderstaartdekveren verraden keizergans invloeden. De bredewitte kol, die ver over de kruin doorloopt en de gele oogring hinten naar dwerggans.
As well as the quite small bill.

so I think the most likely ID is erythropus x canagicus

I can not 100% exclude albifrons x canagicus but I think it ios not very likely, the ones i have seen have a longer bill.



Titel: hybride A. erythropus x A. canagicus?
Bericht door: Alcedo atthis op oktober 19, 2007, 18:17:42 PM
Emperor x greater whitefront for comparison:

Two siblings:

http://www.pbase.com/marvbreece/image/57944638 (http://www.pbase.com/marvbreece/image/57944638)

http://www.pbase.com/marvbreece/image/57944639 (http://www.pbase.com/marvbreece/image/57944639)
Titel: hybride A. erythropus x A. canagicus?
Bericht door: laatvlieger op november 02, 2007, 10:31:50 AM
It's not about this hybrid, but dark spots on the undertailfeathers also seems to occur in blue phase snow goose. So the fact that a bird shows dark undertailspots doesn't seem te be an excluding character:

http://www.carolinanature.com/birds/snowgeese.html (http://www.carolinanature.com/birds/snowgeese.html)

Third foto
Titel: hybride A. erythropus x A. canagicus?
Bericht door: Alcedo atthis op november 02, 2007, 13:20:20 PM
CiteerIt's not about this hybrid, but dark spots on the undertailfeathers also seems to occur in blue phase snow goose. So the fact that a bird shows dark undertailspots doesn't seem te be an excluding character:

http://www.carolinanature.com/birds/snowgeese.html (http://www.carolinanature.com/birds/snowgeese.html)

Third foto
Yes, that is true about blue phase snow geese, and also few hybrids  Canada x (Blue phase?) Snow goose show this feature.

meanwhile , I stumbled over this:

http://waarneming.nl/soort.php?id=7739&wno...um_tm=&tab=foto (http://waarneming.nl/soort.php?id=7739&wno_datum_van=&wno_datum_tm=&tab=foto)

I thought there is not much doubt about the ID? At least it isn´t to me.

Titel: hybride A. erythropus x A. canagicus?
Bericht door: laatvlieger op november 02, 2007, 14:47:21 PM
The person who sighted it, doesn't respond very quickly to his e-mail, so probably that's the reason. I've now tried it through a different way and hope he'll respond. It's a rare hybrid, I think it's even the first for the Waarneming.nl database.