The email address of the person (Maureen) with the video footage of the all
yellow YTBC in Ballarat is
She would be wrapped if someone was interested enough to see the footage
cheers
mike
---- wrote:
> Hi Chris,
>
> On the site you provided a link for, it has an example of a YTBC that is
> prodominantly yellow.
>
> The description is "Bird is washed out in patches alternating with dark =
> partial leucistic/lutino"
>
> However, what you say about it being hyperxanthic is an interesting point
> too.
>
> The following questions are raised in my mind:
>
> 1.\ If a yellow YTBC is classed as being Luecistic, would this mean that
> a YTBC is 'capable' of being yellow all over, but the black pigment is
> usually strong enough to overpower the yellow colouration.
>
> 2.\ If a yellow YTBC is classed as hyperxanthic, would this mean that the
> yellow pigment is so strong that its overpowering the black pigment? Or
> potentially the bird is partially luecistic in its black pigmentation, and
> partially hyperxanthic in its yellow pigment...or combination there of???
>
> The following is from the article:
>
> Feathers (and scales in snakes for instance) can have multiple
> concentrations of multiple pigments. When one of these pigments, say black
> for ease of understanding, is missing, the color appears washed out --
> that is, it is left without the darkness created by the black pigment, in
> addition to say, red and yellow (those are the three common pigments in
> nature). This is the generally accepted use of leucism -- some pigment
> missing, but some pigments left.
>
> So what I can deduce from this (to answer my own questions) is that
> possibly a YTBC has no red pigments, only yellow and black. So a yellow
> YTBC is probably Luecistic, meaning the black pigment is missing, and the
> yellow pigment remains all over the body.
>
> Peter
>
>
>
>
>
>
>
>
>
>
> "Chris Sanderson" <>
> Sent by:
> 23/11/2006 05:24 PM
>
> To
> "Mike Jarman" <>
> cc
>
> Subject
> Re: [Birding-Aus] (NOT) Melanistic Yellow-tailed Black-cockatoo
>
>
>
>
>
>
> Hi Mike,
>
> I believe the correct term for too much yellow pigment is hyperxanthic
> (based on a non-exhaustive google search on the topic of feather pigment
> anomolies). Your bird is possibly a combination of leucistic (lacking
> dark
> pigments) and hyperxanthic (overabundance of yellow) creating the strange
> combination in your bird.
>
> This website has seemingly good descriptions (though I'm no
> aviculturalist)
> and links to pictures at the bottom to illustrate examples.
> http://www.pkblogs.com/milkriver/2005/03/env-albinism.html
>
> Regards,
> Chris
>
> On 11/23/06, Mike Jarman <> wrote:
> >
> >
> > Philip Veerman pointed out to me that the term melanistic is not correct
> > for this bird as melanistic means an excess of black pigment. Maybe the
> > term is leucistic, I dont really know. But whatever the terminology
> is, it
> > sounds like a spectacular bird.
> >
> >
> > Greg,
> > I have seen a pair of osprey hanging around Lake Conjola (NSW south
> coast)
> > for the last few months. What time of year do they normally breed? Lake
> > Conjola has many large trees around the shores and in the tributaries
> that
> > could possibly host a breeding pair.
> >
> >
> > cheers
> >
> > mike
> >
> >
> >
> > ---- Greg <> wrote:
> > > Hi Mike,
> > >
> > > A few years ago there was an adult female Glossy Black-Cockatoo
> feeding
> > > young in a large hollow in a Scribbly Gum south of Grafton, North
> Coast
> > NSW.
> > > She was completely yellow apart from some greyinh edging to the
> feathers
> > and
> > > an orange tail panel. Quite a sight!
> > >
> > >
> > > Regards
> > >
> > > Greg Clancy
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