Why is it difficult to piece together a whole skeleton from a pellet?

Piecing together a whole skeleton from a pellet is challenging because pellets contain only a small, often fragmented portion of the prey's remains, typically bones, fur, and feathers that have been compacted and digested. Additionally, the bones may be broken or worn down, making it hard to identify specific skeletal elements or determine their original position. The variety of species that an owl may consume also complicates the reconstruction, as different animals have distinct skeletal structures. Finally, the process of digestion can lead to the loss of small bones, further hindering the ability to assemble a complete skeleton.