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On average, there are 10,000 million insects living in every square
kilometre of habitable land on Earth - that's 10,000 in every square metre.
Think about that when you next step into your garden or walk along a
footpath!

Insects have a much greater impact on the planet than vertebrates. In
tropical forests, insects eat 12-15% of the total leaf area, compared to just
2-3% eaten by vertebrates. Insects eat 15-20% of all crops grown for
human food.

A leaf-cutter ant colony contains millions of individuals: they excavate a
room-sized underground chamber in which they cultivate fungus gardens.

The largest known beetle is the Titan beetle of the Amazonian rainforest:
the adults are up to 17cm long.

Fossils from the Carboniferous period show that some early dragonflies
were much bigger than today's: they had a wingspan of up to 76cm -
wider than a pigeon's.

The smallest insects are fairyflies - minute parasitic wasps that 'fly'
underwater with wings that are simple hair-fringed struts.

Termites invented air conditioning millions of years ago: their massive
mounds are a complex ventilation system for the underground nest of the
colony.

Individual termites are small but there are so many of them living in the
soil of the African savannah that their biomass per square kilometre is
twice that of the herds of grazing game animals above them.

Dragonflies are among the fastest flyers over normal distances: they can
reach speeds of up to 36mph.

Insects were farmers long before humans: termites cultivate fungus
gardens under their mounds; leaf-cutter ants make underground compost
heaps; and many ant species tend and protect 'herds' of aphids to gather
their honeydew.

Based in information provided by BBC's Life in the Undergrowth.