Fonesca's grandmother, Jercina Martinelli, told the newspaper, “There were many more webs and spiders than you can see in the video. We’ve seen this before, always at dusk on days when it’s been really hot.”
The creepy tendency of these spiders to take to the air is common of the species parawixia bistriata during warm and humid weather, Federal University of Minas Gerais professor and arachnology specialist Adalberto Santos told The Guardian.
The spiders tend to be social, and at night, they band together to form a large web to catch food, Santos said. Spiders who appear to be flying are actually "ballooning," or using web to catch gusts of air and glide, Gizmodo reported.
And to those who hate spiders, be reassured -- these spiders' venom isn't harmful to humans, according to Santos.
“They benefit us far more than they harm us,” he said.