Owl 'pellets' without fur?

Hi, 

Can you help with a puzzle please? This morning I found a pile of small mammal bones at the bottom of a fence post in local woods. Last year we had Long Eared Owls nesting in these woods and there are other owl species in the area too, so I am often on the lookout for owl activity in these woods, especially at this time of year. I have found few pellets so far this year, but then came across this this morning. I have found similar piles of bones in the past in another area, but assumed that they were old pellets where the softer material had dissolved away because of weather. That can't be the case with this find as it can only have been there a few days at most (I walk here regularly) and we have had very little rain in that time.

So, my question is, do owls sometimes just regurgitate bone without other pellet material?

Thanks in advance.