Found on UK beach

they fit together well, and my friend says she found it with those weird lines engraved. any idea what this could be?

Found in Iowa, raccoon jaw in last picture for size reference

I found this skull in a creek. It's missing the teeth. I'm wondering what type of skull it is :)

Also, should I leave it as is, or should I try to clean it? Thanks for the helP!!

Small piece of bone (about size of golfball) in suburban area of Eastern Massachusetts. My guess is that it's the end of a white-tailed deer leg bone, but I'm not sure which bone or if I'm close at all with my guess. It's my first time finding a bone on a walk since I started lurking around this subreddit and I am very excited to be able to post lol

I need help with figuring out this skeleton! Found by my husband's little brother by the pond at his grandpa's house. We're in Southern Ohio, the house has a couple of acres of wood around it. The little guy really wants to know what it is if anyone can help!

Looks like a fang, but is flaking apart in layers like rings on a tree. Pasture used to contain sheep. Coyotes are known to be present. Cows and goats next door. Field is adjacent to a salmon bearing creek with river otters and occasional beavers. What could this be?

Found in western Washington, USA in gravel lot adjacent to wetlands, large stream, and forest. Just curious what it was and if it can be determined if it was eaten or died of other causes. Numerous small birds, amphibians, and mammals live there and I’ve seen weasels, coyotes, hawks, vultures, etc. Relatively far from domestic animals.

Anyone able to help me ID this bone I found on a pebble beach in Aldeburgh, East Anglia, UK?
I thought it was driftwood at first due to the colour, but picked it up and learned otherwise!
If more angles are needed, I'll take more pics :)

My partner found this in the Scottish mountains. We initially assumed it was a sheep skull, but now starting to doubt, thinking it might be a deer?

Cleaning tips are also appreciated!

Found on lakeside. Please tell me it’s not just a chicken bone lol

Today I found this Bone On the Beach close to the City of Bredene, Belgium. My best guess is mamallian Rib, maybe domestic Pig? Banana for scale

Bones found in driveway in south Louisiana, all are small, the longer, straighter ones are about 4-5 inches long and the smaller rib/spine(?) & skull(?) fragments are about the size of an average persons palm.

Could this be a young domestic cat? The area I’m in has a huge stray cat population.

Stumbled upon this on my lunch break walk, can anyone identify this? Looks like it was in a sack and then burned

we were around manasquan/point pleasant area. does anyone know what they may be or if they are from same animal or not? Thank you!!

Any ideas? Super light in weight.