Caddis Fly



Caddis fly larvae live underwater, where they famously make cases to live and pupate in by spinning together bits of stone, sand, leaves and twig with a silk they secrete from glands around the mouth. The mainly nocturnal adults are often attracted to moth traps, or can be found on vegetation near to the water's edge in all kinds of wetland habitat. There are almost 200 species of caddis fly (order Trichoptera) in the UK, the largest of which is more than 3cm long. They are an important food source for all kinds of predators including Salmon and Trout.

How to identify

Adult caddis flies resemble moths, but with their wings folded back along the body and with very long antennae. Unlike moths, they have a fine set of hairs on their wings instead of scales.

Where to find it



When to find it

  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December

How can people help

The Wildlife Trusts manage many wetland nature reserves for the benefit of all kinds of wildlife, from bugs to dragonflies, fish to Otters. But these precious sites are under threat from development, drainage and climate change. You can help by supporting your local Trust and becoming a member; you'll find out about exciting wildlife happenings, events on your doorstep and volunteering opportunities, and be helping local wildlife along the way.

Species information

Common name
Caddis Fly
Latin name
Other insects
Length: 0.9-3cm
Conservation status
Mostly common. Some are rarer such as the Small Grey Sedge and Scarce Grey Flag which are classified as Priority Species in the UK Biodiversity Action Plan.