Showing posts with label leucistic. Show all posts
Showing posts with label leucistic. Show all posts

Tuesday, February 17, 2015

[Bird]: Rock Dove


Rock Dove (Columba livia)

(Bird: Columbidae)


Feral pigeon (wild plumage). 22nd July, 2009. London (UK).

Feral pigeon (feral plumage). 27th June, 2009. Edmonton (Alberta-Canada).
Feral pigeon (intergrade plumage). 20th July, 2009. Southampton (Hampshire-UK).
Feral pigeons. 19th November, 2011. Santa Barbara (California-USA).
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Leucistic adult with wild-type plumage. 20th July, 2009.
Southampton (Hampshire-UK).
Leucistic adult. 6th March, 2010. Bentleigh East (Victoria-Australia)
Leucistic adult with albino-like eyes. 20th July, 2009. Southampton (Hampshire-UK)
Hypophaeomelanin schizochroistic or variant leucistic adult.
22nd July, 2009. London (UK)
Hypoeumelanin schizochroistic or variant "cinnamon" leucistic adult
showing feral-type plumage. 22nd July, 2009. London (UK).

Hypoeumelanin schizochroistic bird with plumage closer to
wild birds. 23rd July, 2009. London (UK).
A variant leucistic adult showing both cinnamon colouration of hypoeumelanin
schizochroism and white feathering typical of complete leucism. Feral-type
plumage. 4th February, 2010. Bentleigh East (Victoria-Australia).
Partially hypoeumelanin schizochroistic bird with "wild-type" plumage.
 7th May, 2007.  Southampton (Hampshire-UK)
Melanistic adult. 23rd July, 2009. London (UK)
Melanistic leucistic adult with feral-type plumage. 10th February, 2010.
Bentleigh East (Victoria-Australia).
Melanistic leucistic adult. 21st July, 2009. London (UK).
A brownish bird with wild-type plumage. 21st July, 2009.
London (UK).
Several odd birds. The two in the center are a slightly melanistic bird (top)
and a variant leucistic bird (bottom). Both feature wild-type plumage. 

23rd July, 2009. London (UK).
Describing this particular bird would be a bit of a mouthful...it has at least two
leucism types (complete and hypoeumelanin schizo), and melanism in the all-dark wing
 areas
. 23rd July, 2009. London (UK).
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Notes:
Despite what it said about pigeons, there is little doubt that they remain one of the most successful birds in the world. Their adaptability to all kinds of environments except the most extreme is shared by only a few other birds. Unfortunately, nearly all rock doves seen are derived from captive birds. These "feral" pigeons (ssp. domestica) are confiding, tame and urban birds unlike the secretive wild birds that inhabit remote cliffs and rocky areas. Though all "feral pigeons" are rock doves, the species name rock dove should only be used to describe genuine wild birds, the same way pet dogs should not be called wolves. 

Extensive captive breeding of this species for racing or otherwise has resulted in the high abundance of several plumage mutations that are otherwise extremely rare in nature. As captive birds do not face the same dangers as wild birds, these mutations are spread to offspring at a much greater rate and over hundreds of years these odd coloured birds may well occur in over 1 in 4 birds.

Outside of Europe they are generally called rock pigeons instead of rock doves. The difference between a pigeon and dove is somewhat arbitrary; doves are usually the more slender and longer tailed birds in the family, whereas pigeons are the chunkier larger short-tailed birds. Both the rock
dove and stock dove are large heavy birds that probably fit the "pigeon" label better.

I have seen this species in:
  • Europe (GB)
  • America (USA-Canada)
  • Europe (GB)

The first time I recorded this species:
ssp. domestica: 2nd April, 2006 is my earliest record of the species, with a flock of birds from Hythe (Hampshire-UK). Though I have certainly seen these birds before this date.

Monday, February 16, 2015

[Bird]: Greylag Goose


Greylag Goose (Anser anser)

(Bird: Anatidae)

22nd July, 2009. London. (UK)
Two adults with Canada geese. 27th October, 2014. Keyhaven (Hampshire-UK)
Domestic geese. 19th August, 2010. The Summit, Trafalgar (Victoria-Australia).
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Leucistic. May be domestic offshoot. 22nd July, 2009. London (UK)
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Notes:
Like mallards, this widely domesticated species is hard to identify for sure in the field. Numerous domestic breeds have long been released and hybridized with "pure wild" geese. Despite this, if it looks fine for a normal greylag, it probably is. Any greylag-type geese away from Europe are more suspicious, as greylags do not generally migrate and it is unlikely a true wild bird would turn up in say Australia. Note the scientific name; this goose is the nominate goose species, meaning it was the first species described. It features the latin root of the family name Anatidae in both its genus and species name.

I have seen this species in:
  • Europe (GB)
  • Oceania (Australia)

The first time I recorded this species:
Before 2007. Lakeside, England.

[Bird]: Red Kite


Red Kite (Milvus milvus)

(Bird: Acciptridae)


1st July, 2013. Gigrin Farm (Wales-UK).
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Leucistic bird. 1st July, 2013. Gigrin Farm (Wales-UK).
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Notes:
Kites are odd birds that are unlike hawks or falcons. The triangular tail and wing shape is quite specific to these birds. They are generally scavengers and glide and drift around, presumably the reasoning behind the name kite. This species, despite its inability to hunt and kill live prey, has been poisoned and shot by gamekeepers throughout history in fear for their livestock. Some early declines of this bird were inadvertently due to toxic insecticides.

I have seen this species in:
  • Europe (GB)

The first time I recorded this species:
1st December, 2007 at a roost site (Hampshire-UK).

[Bird]: Common Buzzard


Common Buzzard (Buteo buteo)

(Bird: Acciptridae)




A darker and paler individual at the same site. 1st July, 2013. Gigrin Farm. (Wales-UK)
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Leucistic. 1st December, 2007. Red kite location (Hampshire-UK).

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Notes:
The default large hawk in England. Very variable, occurring in a wide variety of light, dark and intermediate appearances that are individual based.

I have seen this species in:
  • Europe (GB-France)
The first time I recorded this species:
1st of December, 2007 at a Red Kite roosting location (Hampshire-UK). However, I certainly saw this species before this date.

Saturday, February 14, 2015

[Bird]: House Sparrow


House Sparrow (Passer domesticus)

(Bird: Passeridae)


Adult male. 16th October, 2010. Mordialloc (Victoria-Australia)
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Leucistic female. 26th April, 2010. Karkarook Park (Victoria-Australia)
Leucistic female. 19th September, 2014. New Quay (Wales-UK)

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Notes:
One of the most underrated birds, introduced to many countries and common in urban areas. The male at least isn't as dull looking as people often make out. It is one of the more "modern" birds, more recently evolved than many other families. Hence, it is the last bird in nearly all field guides that go by taxonomical order, as this method of ordering starts with the  most primitive species.

I have seen this species in:
  • Europe (GB)
  • America (USA-Canada
  • Oceania (Australia)

The first time I recorded this species:
2nd of April, 2006 in Hythe (Hampshire-UK). However, I certainly saw this species before this date.