* Horses: The evolution of the horse is incredibly well-documented, with fossils spanning over 50 million years and tracing the lineage from small, forest-dwelling creatures to the large, grazing animals we know today.
* Whales: The fossil record for whales is remarkably rich, providing a clear picture of their transition from land-dwelling mammals to ocean giants. We have fossils documenting the evolution of their limbs into flippers, their nostrils moving to the top of their heads, and their bodies becoming streamlined for swimming.
* Humans: The hominid fossil record is quite detailed, with numerous fossils providing insight into the evolution of our species. While it's not as extensive as some other lineages, it provides a wealth of information about our ancestors and their adaptations.
Ultimately, the "most complete" fossil record is constantly evolving as new discoveries are made. The most important aspect is that each of these lineages offers a fascinating window into the history of life on Earth and the amazing processes of evolution.
