A team of researchers from Lund University, the University of Copenhagen and the Nature Research Centre in Lithuania has found that some great reed warblers climb as high as 6,000 meters when they fly over the Sahara Desert and the Mediterranean Sea. In their paper published in the journal Science, the group describes monitoring migrating great reed warblers by affixing tiny data loggers to their backs.
Click here for original story, Great reed warblers fly as high as 6,000 meters over Sahara and Mediterranean
Source: Phys.org