The invention relates to a trap for animals, in particular rats or mice, and for being arranged on a substantially horizontal face, where this meets a substantially vertical face. The trap comprises: a trap housing and a first flange and a second flange that are connected substantially at right angles to the effect that the trap can be arranged in two positions, where the substantially horizontal face meets the substantially vertical face. The flanges and the faces of the trap span, in both positions, a volume which is delimited such as to define a passage in which a rat or a mouse may move. The trap housing further comprises an inner passageway that a rat or a mouse may run into, said passageway extending from the one flange and into the trap housing. Inside the passageway there is a trigger mechanism and a killer mechanism.