Die vorliegende Anmeldung betrifft die Verwendung zum Teil bekannter heterocyclischer Verbindungen zur Bekämpfung von tierischen Schädlingen, zu denen Arthropoden und insbesondere Insekten zählen, ferner neue heterocyclische Verbindungen und Verfahren zu deren Herstellung.Heterocyclic compounds (I), their salts, metal oxide and N-oxides are new. Heterocyclic compounds of formula (I), their salts, metal oxide and N-oxides are new. Either G1 : N, CH or C-halo G2 : thiazole group of formula (A) R1 : H or alkyl and G3 : heterocyclyl, heteroaryl or aryl (all optionally substituted) or G1 : N or C-halo G2 : thiadiazole group of formula (B) and G3 : heterocyclyl, heteroaryl or aryl (all optionally substituted) or G1 : CH G2 : thiadiazole group (B) and G3 : optionally substituted heterocyclyl, substituted furanyl, thienyl (substituted by halo, nitro, amino, alkylamino, dialkylamino, haloalkyl, cycloalkylalkyl, alkoxy, haloalkoxy, alkylthio, alkoxyalkyl, bis(alkoxy)alkyl, alkoxycarbonyl, alpha-hydroxyimino-alkoxycarbonylmethyl, alpha-alkoxyimino-alkoxycarbonylmethyl, C(X)NR2R3, alkylsulfinyl, alkylsulfonyl, heterocyclyl, aryl (optionally substituted by halo, cyano, nitro, alkyl or haloalkyl), heteroaryl (optionally substituted by halo, nitro, alkyl, haloalkyl, alkoxy, haloalkoxy, alkoxyalkyl, alkylthio, alkylthioalkyl or cycloalkyl), or heteroarylalkyl (optionally substituted by halo, nitro, alkyl, haloalkyl, alkoxy, haloalkoxy, alkoxyalkyl, alkylthio, alkylthioalkyl or cycloalkyl)), optionally substituted heteroaryl (comprising pyrrolyl, pyrazolyl, imidazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, 1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,3,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,2,3-thiadiazolyl, 1,2,4-thiadiazolyl, 1,3,4-thiadiazolyl, 1,2,5-thiadiazolyl, pyridyl, pyrimidinyl, pyridazinyl, pyrazinyl, 1,2,3-triazinyl, 1,2,4-triazinyl, 1,3,5-triazinyl, benzofuryl, benzisofuryl, benzothienyl, benzisothienyl, indolyl, isoindolyl, indazolyl,
