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There are two very similar 'brown' thornbills in Tasmania, the Brown and the Tasmanian. I should confess here, that in my early days of birding in Tasmania, without the aid of illustrated bird guides, I rather 'fudged' my sightings of Tasmanian Thornbills. If it was in a wet forest, it must be a "Tasmanian", and vice versa for the "Brown" in drier areas. I must say that in the main, that was probably correct, but these days I'm a little more thorough!
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I've had a bit of an issue with some of the field guides, largely when the description includes statements like, "bill larger in Brown". This may be true, but unless you have the other to compare it with, or very familiar with both species, it's not the most useful piece of informatio
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n. I should say here that I'm not setting myself up as an expert on the issue of 'brown' v 'tasmanian'. In fact, while looking through the many images of the 2 species that I've taken, I sometimes got it w
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rong. The reality in the field is that you're often looking at birds in deep shade or high in the canopy and that's when it gets interesting.
I have published the accompanying images to hopefully aid observers, as there doesn't seem to be many images on the internet of the Tasmanian Thornbill. Many have their own method of differentiating the two, but the rufous colouring on the primaries and pure white undertail feathers (lack of buff), stand out. I hope the images prove useful!