Definition
Insessores is an outdated taxonomic order formerly used to classify perching birds. It's a historical term that grouped birds based on their foot structure, adapted for gripping branches. Think of it like the original 'bird squad,' based on their ability to hang out on trees. The term is not commonly used in modern ornithology, as classification has evolved with new genetic and anatomical insights. It's a bit like using a flip phone when smartphones are all the rage.