There are 160,000 known species of flies, and thats probably only scratching the surface. Flies, which have been around as long as humans, exist on every continent, including Antarctica. His fervent enthusiasm for flies startled me, until I eventually understood his benevolent motives. A handful of species have colonized the oceansa habitat otherwise unreached by insects. Although none of the individuals would survive on their own, the collective thrives. In terms of diversity and sheer numbers, Mr. Balcombe writes, the flys success takes on celestial proportion. Some researchers estimate that there are 17 quadrillion flies on the planet.
swarming flies are not even mentioned in the article.
( z0 mention :ARG0 ( z1 article ) :ARG1 ( z2 fly :ARG0 ( z3 swarm ) ) :mod ( z4 even ) :polarity - )
(z0 / mention-01
    :ARG0 (z1 / article)
    :ARG1 (z2 / fly-01
              :ARG0 (z3 / swarm))
    :mod (z4 / even)
    :polarity -)
swarming flies are not even mentioned in the article .
z2 :ARG0 z3
z0 :mod z4
z0 :polarity 0
z0 :ARG1 z2
z0 :ARG0 z1