In order to improve an implant, in particular a bone replacement implant for insertion into a bone cavity, or an intervertebral implant for insertion between two adjacent vertebral bodies of a human or animal spine, which can be brought from a normal position, in which the implant encompasses a maximum total volume, into an insertion position, in which the implant encompasses an insertion volume, which is smaller than the maximum total volume, such that the implant can be inserted through as small as possible an opening in a human or animal body and nevertheless have a high inherent stability, it is proposed that the implant has a plurality of cavities in fluidic connection with one another, and that a net volume encompassed in the normal position by the plurality of cavities in fluidic connection with one another is smaller than the maximum total volume.