The present invention relates to 1-(azolin-2-yl)amino-1,2-diphenylethane compounds of the formula I and to their salts which are useful for combating animal pests. The invention also relates to a method for controlling animal pests by using these compounds, to seed and to an agricultural and veterinary composition comprising said compounds. wherein A is a radical of formulae A.1 or A.2 wherein # denotes the bond to the remaining compound of formula I, X is selected from O, S and NRX, R1 is selected from the group consisting of &mdash；ORA, &mdash；NRB1RB2, &mdash；C(&boxH；O)&mdash；RC, &mdash；C(&boxH；O)&mdash；ORD, &mdash；C(&boxH；O)&mdash；SRE, &mdash；C(&boxH；O)&mdash；NRB1RB2&prime；, &mdash；C(&boxH；S)&mdash；RC&prime；, &mdash；C(&boxH；S)&mdash；ORD&prime；, &mdash；C(&boxH；S)&mdash；SRE&prime；, &mdash；C(&boxH；S)&mdash；NRB1RB2, &mdash；C(&boxH；NR1a)&mdash；RC&prime；, &mdash；C(&boxH；NR1b)&mdash；ORD&prime；, &mdash；C(&boxH；NR1c)&mdash；SRE&prime；, &mdash；C(&boxH；NR1d)&mdash；NRB1RB2, &mdash；S(&boxH；O)&mdash；RF, &mdash；S(&boxH；O)2&mdash；RG, &mdash；S(&boxH；O)2&mdash；NRB1RB2&prime；, &mdash；P(&boxH；O)RH1RH2, &mdash；P(&boxH；S)RH1RH2, &mdash；B&mdash；C(&boxH；O)&mdash；RI, &mdash；B&mdash；O&mdash；C(&boxH；O)&mdash；RI, &mdash；B&mdash；S&mdash；C(&boxH；O)&mdash；RI, &mdash；B&mdash；N(RJ)&mdash；C(&boxH；O)&mdash；RK, &mdash；B&mdash；C(&boxH；S)&mdash；RK, &mdash；B&mdash；O&mdash；C(&boxH；S)&mdash；RK, &mdash；B&mdash；S&mdash；C(&boxH；S)&mdash；RK, &mdash；B&mdash；N(RJ)&mdash；C(&boxH；S)&mdash；RK, C1-C8-alkenyl, C1-C8-alkynyl, C3-C8-cycloalkyl, which is unsubstituted or may carry 1 to 4 substituents R1e, naphthyl, which is unsubstituted or may carry 1 to 4 substituents R1f, a saturated or partially unsaturated heterocycle, which is unsubstituted or may carry 1 to 4 substituents R1g, hetaryl, which is unsubstituted or may carry 1 to 4 substituents R1h, and C1-C6-alkyl, which carries a radical selected from the group consisting of &mdash；NR1iR1j, C1-C4-alkoxycarbonyl, C3-C8-cycloalkyl, aryl, aryloxy, arylthio, heterocy
