Online Mendelian Inheritance in Animals (OMIA, https://omia.org/ home/) is a freely available, curated, online database. OMIA provides upto-date summary information on all known harmful and beneficial variants in animals, together with background information on all known inherited disorders and non-disease traits, which are called 'phenes'. OMIA curation focuses on phenes with confirmed and suspected Mendelian modes of inheritance. Several phenes caused by somatic mutations, chromosomal abnormalities, genetic modifications, or phenes with unknown or complex modes of inheritance are also included.