BOCA has recently been researching the effects of supplementary feeding and
our policy on it is now available as
http://boca.org.au/dmdocuments/brochures_2010_05_policy_on_bird_feeding.pdf
On 31 May 2010 17:38, Belinda Cassidy <> wrote:
> Laurie,
>
> Thanks for the article; I provide supplement bird feed for several species
> myself, so I always appreciate reading new research .
>
> Its interesting to wonder why these birds are called `Great Tits'. I
> can't
> believe I have to use that term, lol.. I wonder if Google will net-nanny me
> for referring them by name? Is that why you sent a link rather than
> embebding the article? I am going to refer to them as `birds' because its
> kind of weird to call them by the correct name.
>
> Anyway, its also interesting to wonder why the birds with supplement food
> had worse hatching success than the ones who weren't .
>
> One thing that springs to mind is Beef tallow and peanut cake don't have a
> lot of calcium in them (for egg shell development). They are insectivores,
> which usually get a lot of calcium from the exoskeletons of bugs, so I am
> not sure that the food provided was right for them. It also sounds a bit
> fat
> rich too.
>
> Normally birds are canny enough to sort these kinds of things out, but
> perhaps the supplement feed attracted too many birds to the area, and the
> supplement feed became more important than it would have been otherwise?
>
> I've only seen this happen in Australia with crows, who have a tendency to
> invade any area with supplement food, to the detriment of breeding pairs.
>
> I'd be interested in hearing other thoughts?
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