Are there any mammals birds or reptiles that are transparent enough one can clearly see its bones?

No, there are no mammals, birds, or reptiles that are transparent enough to clearly see their bones without any external aid.

While some creatures, like jellyfish and certain types of fish, exhibit transparency, the complexity of the skeletal structures and internal organs in mammals, birds, and reptiles prevent them from being truly transparent.

Even with species that have some degree of translucent skin, such as certain amphibians or some deep-sea fish, their bones are still obscured by other tissues and internal organs.

To see the bones of these animals, you would need to use imaging techniques like X-rays or CT scans, which use radiation to create images of the internal structures.