Fastest animals Fastest animals This is a list of the fastest animals in the world, grouped by types of animal. The fastest land animal is the cheetah, which has a recorded speed of . The peregrine falcon is the fastest bird and the fastest member of the animal kingdom with a diving speed of . The fastest animal in the sea is the black marlin, which has a recorded speed of . While comparing between various classes of animals, a different unit is used, body length per second for organisms. The fastest organism on earth, relative to body length, is the South
Planet of the Dead Ryan described her casting as a "real honour", noting that she "love[s] the character". Ryan was rumoured to be in line for a role as full-time companion to the incoming Eleventh Doctor (Matt Smith) and her casting in "Planet of the Dead", combined with her previous working history with incoming Executive Producer Steven Moffat - the two working together on "Jekyll", fuelled speculation that she might return to "Doctor Who" accompanying the Eleventh Doctor in Series 5. Ryan herself has said that she is open for a return to the character, however, stating that she is a "commitment phobe" at