The footage shows the burning of fluffy poplar tree seeds in Parque del Cidacos in Calahorra, Spain.
"The downy fluff comprises tiny fibres that surround seeds inside the catkins of poplars and willows," Dr. Matthew Brookhouse, a tree expert at Australian National University, explained on the university's website.
The fibers can also be highly flammable, as seen in this video. It is not clear from the video if the fire was intentionally set to remove the fluff, as has been suggested, or was an accidental occurrence. "In the Cidacos de Calahorra park there is no 'controlled burning' of poplar fluff. Every spring it is common for people with little heads to cause these fires. They are very dangerous and spread quickly," Garrido tweeted.
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