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I dont normally believe in conspiracies, but if there
is one then the brown goshawk/collared sparrowhawk would be a prime
example.
I think it is all a big joke created by
taxonomists/systematicists and ecologists.
I agree with Rogers assessment of Simpson and Day which
makes it pretty impossible to distinguish these birds, and most other Field
guides arn't much better. In any case, all the features given like 'square vs
rounder tail, longer back toe, and different colour- browner' are all
poor characteristics for distinguishing species in taxonomy. Not to mention
it being almost 'not humanly possible' to distinguish these features in fast
flying forest birds.
Probably Christidis and Boles and Mark Clayton were
involved in the conspiracy and are cracking-up every time they see a
Birder trying to ID an 'Accipiter' flying swiftly through the forest in and out
of trees and shadows. When in actual fact they know they are just one species,
and how silly birders are, to convince themselves they can see
differences. In fact it would make a good Larson
cartoon.
And I was one of them yesterday. At least the bird I
saw E of Calwell was standing still, but it was within the tree canopy, which
made it hard enough. I thought it was a collared
sparrowhawk.
Benj
Roger - Briefly:
1 The CS adult and BG adult have almost identical
colouration. Immatures of both are different (darker, browner) and
resemble one another
2 In the below, 1 and 4 are BGs, 2 and 3
CSs
3 Appropriately, the guides draw attention to
structural features as the best way to distinguish the 2 species (eye, tail,
feet). Shape is not a good guide as the females of both can appear
bulkier. g
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