In written English, the phrase 'swarm in' can be used to describe a large number of things entering a space all at once.
For example, "The bees swarmed in to the hollow tree."
Gnats swarm in invisible clouds.
Rare butterflies (Anthinacus and Xalmoxys) swarm in the trees.
The ball was kicked towards the Clermont line, Nalaga chased by a swarm in red.
But blink, and the shapes swarm in and out — a Cubistic fire drill.
Nowadays he can catch an ordinary swarm in a few minutes.
More emoticons swarm in the background – winking, laughing, wearing sunglasses, looking evil.
The Enola swarm in the early 1980s occurred about 10 miles to the southeast.
Many governments have been slow to act, and some hostile towards the "swarm" (in David Cameron's words) of humanity.
Animals are particularly susceptible to hunting as they migrate, because they swarm in vast groups at predictable times and places.
Angels swarm in a molten cloud of gold that cascades upward in an art of pure decorative exuberance.
