23 May 2014 Last updated at 17:44
By Mark Kinver
Environment reporter, BBC News
UK researchers that headed to South America to learn more about one of the world's rarest parrots have returned with "more questions than answers".
A team from Chester Zoo spent three weeks studying Ecuador Amazon parrots.
The parrot was only reclassified as a species in its own right in December, before which it was deemed to be a subspecies of a common group of birds.
Only 600 individuals are estimated to remain in the wild, prompting the new species to be listed as Endangered.
"The truth is that we came back with far more questions than answers," explained expedition leader Mark Pilgrim, director general of Chester Zoo.
"Suddenly, there are a whole number of things that we didn't expect and we now have questions about."
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