continent,mass_extant,mass_extinct,diff
AF,31794.525730180805,970038.4615384615,-938243.9358082807
AUS,17484.882608695647,188355.55555555556,-170870.6729468599
Af,,,
EA,36413.19457236843,,
Insular,12431.589628820964,95177.912,-82746.32237117903
NA,11071.727358490578,735076.1025641026,-724004.375205612
Oceanic,8568480.222666668,,
SA,4126.67529274004,985889.1315789474,-981762.4562862074