A shoal of fish


Swarming happens when animals gather or travel together in large numbers. Its most familiar examples are in insects, such as locusts and midges, flocking birds and shoaling fish. Some animals swarm as a defence against predation, others, such as locusts and bees, only form swarms in specific circumstances. Swarming can be carried out by the smallest and simplest micro-organisms, such as bacteria, and even by humans.

Watch video clips from past programmes (21 clips)

In order to see this content you need to have an up-to-date version of Flash installed and Javascript turned on.

View all 21 video clips

Video collections

Take a trip through the natural world with our themed collections of video clips from the natural history archive.

Elsewhere on the BBC

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.