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sorry i didn't say it before.
Notice the colours of the legs there you have the mayor differences between the 3 species that you can see in Atacama or in Chile.
I agree with Carolina, follow these links (birds from Chile)
http://www.avesdechile.cl/272.htm
http://www.avesdechile.cl/031.htm
http://www.avesdechile.cl/103.htm
and you'll se the diference
i named it that way translating the common name in Spanish, thanx for the comment Liam
thanx
