Arsenal boss Arsene Wenger highlighted Alex Song's performance in victory over Birmingham City.Song was again outstanding in his defensive role and Wenger told arsenal.com: "He is strong and smooth. He is not rigid, he is agile."He is a slalom player and is not a straight-line player. He uses that very well, he has a good combination of strengths and agility and I believe as well he uses his technique in a very intelligent way. He likes a tackle."Cameroon people are strong, you know? In Africa they call them the Germans of Africa because of their strong bodies."