Analysis of information sources in references of the Wikipedia article "Alex (parrot)" in English language version.
Science's best known parrot died on September 6th, aged 31
Alex, a parrot that could count to six, identify colors and even express frustration with repetitive scientific trials, has died after 30 years of helping researchers better understand the avian brain.
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: CS1 maint: unfit URL (link)Science's best known parrot died on September 6th, aged 31