Seen here is a model-based reconstruction of life on an ancient forest floor during the Pennsylvanian Period - the "Age of Coal Swamps". This is a public exhibit at the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania.

From exhibit signage:

Pennsylvanian Coal Forest

No birds winged through the Pennsylvanian-aged swamps because birds would not evolve for another 100 million years. think how quiet the forests must have been without their songs. Only the rustling of the leaves, the hum of the wings of giant dragonflies - the largest insects that ever lived - and the scurrying sounds of giant cockroaches and centipedes could be heard. Perhaps the peace was occasionally disturbed by whatever sounds might have come from huge amphibians like Eryops and reptiles like Edaphosaurus as they slogged through the swamps.