They swim well and fly adequately but are almost helpless on land , because their legs are placed towards the rear of the body .
Divers are aquatic birds the size of a large duck , to which they are unrelated .
Divers swim well and fly adequately but are almost helpless on land , because Divers ' legs are placed towards the rear of the body .
Divers are aquatic birds the size of a large duck , to which they are unrelated .