Elephant bird process of continental drift. Claims of findings of "aepyornithid" egg remains on the eastern Canary Islands, if valid, would represent a major biogeographical enigma. These islands are not thought to have been connected to mainland Africa when elephant birds were alive. There is no indication that elephant birds evolved outside Madagascar, and today, the Canary Island eggshells are considered to belong to extinct North African birds that may not have been ratites (possibly "Eremopezus"/"Psammornis", or even Pelagornithidae, prehistoric seabirds of immense size). Various "aepyornithid-like" eggs and bones occur in Paleogene and Miocene deposits in Africa and Europe. Two whole eggs
Bleaker Island by stands of tussac grass. The island is home to a wide variety of wildlife including southern sea lions with some visiting southern elephant seals. Norway rats were accidentally introduced to the island in the 1980s. They have now spread throughout the island and onto First, Second and Third Islands. Overgrazing was a problem but reduced grazing pressure is helping the slow regeneration of tussac and native flowering plants. The Bleaker Island group has been identified by BirdLife International as an Important Bird Area. A survey identified 49 bird species on the islands, 37 of which were confirmed as breeding