The invention relates to N-substituted hetero-bicyclic compounds of formula (I), to the enantiomers, diastereomers and salts thereof and to compositions comprising such compounds. The invention also relates to methods and uses of these N-substituted hetero-bicyclic compounds, and of compositions comprising thereof, for combating and controlling animal pests. Furthermore the invention relates also to pesticidal methods of applying such N-substituted hetero-bicyclic compounds. The N-substituted hetero-bicyclic compounds of the present invention are defined by the following formula I: wherein A, B, X, Het, R1, R2, W1, W2, W3 and W4 are defined as in the description.
