Little tube shaped pieces of brown crap on my grassland - what could it be? There are these little pieces of what looks like dog poop or...

There are these little pieces of what looks like dog poop or Canadien geese poop adjectives over my lawn. I imply it's on almost every square food. I think I would enjoy noticed a flock of birds or a pack of dogs going to the restroom on the grassland...what could it be?
Bamboo - I own a incredibly outmoded one...
Answers:    If you don't do your own grass cutting possibly the lawn service culture aerated (spelling might be wrong) with a device. I had mine done and it is supposed to be obedient for the lawn.
There's a a bit life-size mourning dove that...
Could it be something close to seeds past its sell-by date of trees--wind blown there???
Could it be halloweeners scattering things on your prairie???