1. Being four more than forty
   - forty-four, 44

See also: cardinal

• order Ophioglossales
• order Opiliones
• order Opuntiales
• order Orchidales
• order Ornithischia
• order Orthoptera
• order Ostariophysi
• Order Osteoglossiformes
• order Ostracodermi
• order Palmales
• order Pandanales
• order Papaverales
• order paper
• order Parietales
• order Passeriformes
• order Pectinibranchia
• order Pediculati
• order Pedipalpi
• order Pelecaniformes
• order Pelycosauria
• order Perciformes
• order Percomorphi
• order Perissodactyla
• order Peronosporales
• order Pezizales