Abstract: A reptile grow-out pen assembly (20) for containing a reptile, in particular a crocodile, includes an elongate container having at least one side having an opening (42) for entry of food into the container and at leat one closable and openable aperture (40f) associated with the container for entry and exit of the reptile, the container having at least a floor portion (40d) and side wall portion wherein in use of the reptile grow-out pen, at least a portion of the floor and at least a portion of the side wall are adapted to be submerged in water. Also disclosed is a reptile grow-out arrangement used for growing-out of reptiles including a plurality of enclosures (10a, 10b, 10c) each having at least one water body and a sloped reptile basking region located within the reptile enclosure and wherein the enclosures are connected so as to allow the flow of water from one enclosure to another; wherein the proportions of the enclosure are predetermined to minimise infighting amongst the reptiles therein.