Last year's winner was Turkish director Nuri Bilge Ceylan - whose film Once Upon a Time in Anatolia was selected as Turkey's official submission for the best foreign language film Oscar.

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It was during the BBC filming, though, that nine specimens were finally captured, allowing for an official scientific submission this year.

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Rather, a "lack of political will appears to be the only barrier to submission, " according to the unnamed official cited in the study.

CNN: How the violent mentally ill can buy guns

Kingfisher's submission to the civil aviation department lacks detail, the senior official said.

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When study researchers wanted to find out why, they spoke with an unnamed Oklahoma official who said there were no state privacy laws or logistical hurdles blocking record submission in Oklahoma, as there are in other states.

CNN: How the violent mentally ill can buy guns