What Nesting Materials to Leave Out for UK Garden Birds (and What to Avoid)

Updated 30 September 2026 · 7 min read

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Quick answer

The best nesting materials to leave out for garden birds are natural, short and safe: moss, dry grass, small twigs, dead leaves, coconut fibre, and — from your dog or cat’s brush — clean untreated pet fur. Never put out dryer lint, cotton wool, long human hair, string, tinsel or plastic strips: they can tangle around chicks’ legs and adults’ feet or be swallowed and cause blockages.

Best time: late January to April, when birds are gathering.
Where to put it: a small basket or wire ball in a shrub, or in a mesh suet-feeder cage.
Pet fur: only from pets not treated with spot-on flea or tick chemicals in the last few months.
Never: dryer lint, cotton wool, human hair, string, plastic, tinsel.
Legal note: disturbing an active nest is an offence — put material out, don’t touch nests.

Safe nesting materials

Moss — the classic lining for tits and long-tailed tits. Rake a little from a damp lawn or shady path.
Dry grass — cut in short pieces, no more than 10 cm long.
Small twigs — pencil-thickness or less, 10–15 cm long, for structural birds like blackbirds and thrushes.
Dead leaves — a small pile in the corner is used by wrens and dunnocks.
Coconut fibre / coir — sold as a wildlife nesting product, or reused from an old hanging-basket liner.
Pet fur — clean, brushed-out cat or dog fur is a classic, but only from pets who haven’t had spot-on flea, tick or worming chemicals recently (see the warning below).
Sheep’s wool — if you live near sheep pasture, wool caught on fences and gates is welcome material for many species.
Feathers — pigeon and gull feathers found in the garden can be put out for lining.
Straw — small amounts of clean straw for larger species.

Materials to avoid — and why

These materials can and do cause deaths. Please don’t put them out for birds, even if you’ve seen it suggested online.

Dryer lint — soaks up rain, then sets like a wet sponge that dries to a hard crust; also often contains fabric softener chemicals. Not safe.
Cotton wool and cotton wool balls — fibres tangle around tiny legs and beaks; chicks have died from wrapped-around fibres.
Long human hair (or long horse mane hair) — has repeatedly been shown to loop around chicks’ legs, cutting off circulation. If you use hair at all, cut it into pieces no more than 5 cm long.
String, ribbon, thread, wool, twine — as above, plus adults get tangled trying to weave them in.
Plastic strips, plastic-wrapped straw, cellophane, tinsel, foil — swallowed or wound around nestlings.
Fluff or stuffing from cushions, jackets, sleeping bags — often plastic microfibre; the same lint problem, plus microplastics.
Fabric softener sheets — chemical residues.
Fresh grass clippings — they heat up as they ferment and can mould in the nest.

Pet fur: the fine print

Pet fur is one of the most useful nesting materials — and one of the easiest to get wrong. Modern spot-on flea and tick treatments contain insecticides (fipronil, imidacloprid, permethrin and others). These persist on the fur for weeks and can be lethal to insects, aquatic life and, potentially, to nestlings that live in a fur-lined cup.

If your dog or cat has had a spot-on flea, tick or worming treatment in the last few months, don’t put their fur out. Otherwise, fur brushed out of a clean pet is fine.

How to offer nesting material

Push moss and fur into an empty fat-ball feeder or a small wire suet cage.
Hang it from a shrub or under an overhang, sheltered from rain.
Or drape a loose pile in the crook of a hedge.
Add small twigs to a stack in a quiet corner — blackbirds and song thrushes gather them from the ground.

Timing: most UK garden birds start prospecting in February, with real nest-building through March, April and May. Long-tailed tits often begin earliest — sometimes in January. Put material out from late January.

Never touch the nest itself

Under the Wildlife and Countryside Act 1981, it is an offence to take, damage or destroy the nest of any wild bird while it is in use or being built. You can put materials out for birds to choose from, but leave the nest itself alone. Watching birds carry material to a hedge is fine; parting the hedge to look at the nest is not.

Browse nesting material dispensers → US price → Browse nest boxes → US price →

Common questions

Can I put out hair from a hairbrush?

Only if it’s cut into short pieces of no more than 5 cm. Long strands are a real strangulation risk.

Is sheep wool safe?

Yes — natural, unspun wool caught on fences and hedges is used by many bird species and hasn’t been treated with anything harmful.

Should I leave grass clippings for nests?

Only after they’ve fully dried in a thin layer. Fresh clippings pack down, ferment and mould.

Do birds really use pet fur?

Yes — long-tailed tits especially. A single long-tailed tit nest can hold hundreds of feathers and fur pieces as lining.

Related guides

Sources: RSPB and BTO guidance on nesting materials and nest box use; Wildlife and Countryside Act 1981; veterinary guidance on spot-on flea treatments and their environmental persistence.