Solution:
The largest
seabird in history is the Pelagornis sandersi. This prehistoric bird lived around 25 million years ago during the Oligocene epoch. It had an enormous wingspan, estimated to be between 20 to 24 feet (6 to 7.3 meters), making it the largest flying bird to have ever existed. Pelagornis sandersi was adapted for soaring over the oceans, and its wings were long and slender, allowing it to cover great distances while searching for food in the open sea. Despite its impressive size, it had relatively lightweight bones, which helped it stay airborne for extended periods. The discovery of fossils and the study of its anatomy have provided valuable insights into the ancient avian life forms that once roamed our planet's skies.