The summer in southeastern Brazil brought very high temperatures and some disconcerting eight-legged visitors.
Residents in a rural area in the south of Minas Gerais reported that the skies "rain spiders", a phenomenon which according to experts is typical in the region during the hot and humid climate
Photos and videos shared on social media they show hundreds of spiders suspended in the sky.
João Pedro Martinelli Fonseca, who shot one of the most shared videos, was traveling with his family to his grandparents' farm in Espírito Santo do Dourado, about 250 km north-east of Sao Paulo, when he realized that the sky it was covered in black dots.
He told a local newspaper that he was "stunned and frightened" ̵
The boy's grandmother, Jercina Martinelli, told another local newspaper: "There were a lot more networks and spiders than you can see in the video." We have already seen this before, always at twilight in the days in which was very hot. "
In 2013 the same phenomenon caused international sensation when the residents of Santo Antônio da Platina in southern Brazil recorded" spider rains "around the telephone polls.
While it appears that spiders fall from the sky, they are actually hanging from a giant net to capture prey, said Adalberto dos Santos, a professor of biology specializing in arachnology at the Federal University of Minas Gerais.
species parawixia bistriata is a rare "social" spider and the network of communities they build is so thin that it is almost impossible to see for the human eye, giving the illusion that the spiders float in the air.  During the day, the spiders nest in a giant ball in the vegetation, emerging in the early evening to build the gigantic ceiling that hangs between trees and bushes, said Dos Santos. Each canvas can measure up to four meters in width and three meters in thickness.
At dawn, they feed on prey caught at night – usually small insects, but sometimes even small birds – before retreating back into the vegetation.
Testimony a sky full of spiders can be unnerving, but Dos Santos said that humans have nothing to fear: the poison of this species is not harmful to humans and its bite causes little more discomfort than a sting red.
Dos Santos said that the vast network of spiders serves to regulate insects like flies and mosquitoes that come out during the sultry primitive evenings.
"They benefit us much more than they can harm us," he said.