no sir grousers and duck bills are two different things and the germans had duck bills as well,duck bills are the extensions added to tracks to make them wider in bad waether such as snow/mud, in effect what that does is give the tracks more surface area and thereby lower the ground pressure by distributing the weight over a greater area,you then do not sink in as much and then get better traction. grousers help with traction on harder surfaces such as in the game we have,they would also help on ice...we dont have ice...yet?.....find some good pics of a tiger and look at the tracks.you will find that because of the design that they are dirrectional and one is mounted forward and one backward facing. turning in one direction will be easier with better traction than the other. not all tamks are like this. but the TIGER was.