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We recently (July, 2019) went to Bar Harbor, Maine, United States, to visit friends who live on the ocean. My husband took a walk on an established path (he's very serious about Leave No Trace) at the water's edge. The tide was out so he was especially careful of where he stepped. Mostly he stood still on a rock along the coast and took pictures in different directions. Most were zoomed (including the blurry ones!) but some were closer to where he was standing.

He was about a mile down the coast from our friends. There was no visible house, or people, and our friends don't know who owns the land, or what the owners use it for. He didn't see specific paths leading into the land from the ocean side, but they could have been his vantage point.

In some trees he saw strangely shaped net things hanging from branches. They look like drawstring bags with the tops wrapped around the branch. They're wide in the middle so they have a structure, which may be created by the thin black things inside. A few inches up from the bottom they're cinched tight by metal-looking rings. Below that the bottom opens into a shape that looks like an upside down flower. The most blurry picture shows one hanging from a branch over an inlet with a small man-made lighthouse.

They're obviously some type of plastic. It troubled us because we're very much against plastic anywhere outdoors, and especially near the ocean. We also don't approve of things tied to tree branches.

We don't camp or do much outdoor travel at all, so I'm hoping someone here will know what they're used for and why. Most importantly, would the users take them away when they leave?

If they're just for things like food, supplies or trash that people left behind, we'll call the local authorities and report them.

Update August 1, 2019:
My friends found out the nets are used to collect mussels, clams and other crustaceans, to eat them. That makes sense considering all the mussels my husband saw!

They could easily have multiple purposes, including holding suet cakes for birds, so I'm going to accept Jasper's answer as correct!

Net with full string and more trees Closer view Closer view of how it wraps around the branch Net in a tree above lighthouse The shore line Shore line from another direction Mussels Fish in the rocky pong

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    They look like traps for something. What are the black squiggly things inside (if they are inside)? Also who owns the land? Does it appear to be used for anything? Perhaps just inland of the trees we can see – Chris H Jul 20 at 8:10
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    Looks to me similar to the nets for bird feed suet balls (in winter, though). – cbeleites Jul 20 at 12:03
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    They look too elaborate to be trash bags. – ab2 Jul 20 at 20:02
  • Were they clearly attached to the tree or were they tangled against it? – Aravona Jul 22 at 8:24
  • @Aravona, I added a closer picture of how they hung from the branch. It looks like they were wrapped around it. – Sue Jul 28 at 20:42
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I'm pretty sure it's some kind of a suet cake/fat ball, i.e. bird's food, see the first image on the Wikipedia article:

https://en.m.wikipedia.org/wiki/Suet_cake

Blue Tit feeding on a suet cake

(Luc Viatour / https://Lucnix.be)

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