What Birds Attack Boats — and Does the Fake Nest Stop Them All?
Jul 25, 2026
Ask any boat owner what's messing up their deck and most will say seagulls. But gulls aren't the only culprits. Depending on where you moor, pigeons, cormorants, ibis, swallows and even ducks can all decide your boat is prime real estate. Here's a rundown of the usual offenders — and, honestly, which ones a decoy nest will and won't move on.
Seagulls
The classic. Bold, social and territorial, gulls perch, preen and drop acidic mess all over your gelcoat and covers. Because they're so territorial, they're also the birds a decoy nest works best on — no gull wants to tangle with what looks like another pair's defended nest. Decoy nest: very effective.
Pigeons
Common around marinas and wharves, pigeons love sheltered spots under canopies and biminis, and they'll happily nest in a cosy corner if left alone. Their droppings are corrosive too. Pigeons are cautious birds that avoid areas patrolled by gulls, so a decoy nest usually keeps them clear. Decoy nest: effective in most setups.
Cormorants and shags
These big diving birds like to perch on rails, arches and outboards to dry their wings, and they leave a lot behind. They're less bothered by territory games than gulls, so results vary — a nest helps, but on a favourite perch you may need to combine it with removing the spot they love to stand on. Decoy nest: helps, not a guarantee.
Ibis (the “bin chickens”)
In a lot of Australian marinas the white ibis is a growing headache — scavenging, bold and messy. They're opportunists rather than territorial, so a decoy nest is less of a deterrent for a determined ibis than it is for a gull. Keeping food and scraps off the boat matters most here. Decoy nest: limited effect on bold individuals.
Swallows and martins
Small, fast, and famous for building mud nests under any overhang — under the hardtop, in the cockpit, behind fenders. They generally steer clear of areas that look claimed by larger birds, so a nest positioned near their favourite overhang can discourage them. Decoy nest: often effective.
Ducks
Less common, but in some freshwater marinas ducks will hop aboard swim platforms and back decks. They're not put off by gull territory the way smaller birds are, so a nest isn't your best tool for ducks — a physical barrier on the swim platform works better. Decoy nest: not the right fix.
So — does one nest stop every bird?
Honestly, no product does. A decoy nest is brilliant on the birds that respect gull territory — seagulls, pigeons, swallows and most smaller species — because it turns their own instincts against them. On bold opportunists like ibis and ducks it's less powerful, and you'll get the best result by pairing it with a clean, food-free deck.
For the vast majority of boat owners, though, the biggest problem is gulls and pigeons — and that's exactly where a well-placed decoy nest quietly earns its keep.