context: The most obvious difference between the brains of mammals and other vertebrates is in terms of size. On average, a mammal has a brain roughly twice as large as that of a bird of the same body size, and ten times as large as that of a reptile of the same body size.
question: ఒక క్షీరదం యొక్క మెదడు శరీర పరిమాణానికి సంబంధించి పక్షి కంటే ఎన్ని రెట్లు పెద్దది?
answers: twice as large