The ovary is found in isolation.
The ovary -LRB- From ovarium , literally `` egg '' or `` nut '' -RRB- is an ovum-producing reproductive organ , found in pairs in the female as part of the vertebrate female reproductive system .. ovum. ovum. vertebrate. vertebrate. female. female. reproductive system. reproductive system. Birds have only one functional ovary -LRB- the left -RRB- , while the other remains vestigial .. Ovaries in females are analogous to testes in males , in that they are both gonads and endocrine glands .. testes. testicle. Although ovaries occur in a wide variety of animals , both vertebrate and invertebrate , this article is primarily about human ovaries .. vertebrate. vertebrate