Encyclia cochleata by Doris.L: The national flower of Belize, now known as Prosthechea cochleata, has flowers which are unusual in that though the labellum is usually below the column in the orchids, in the members of Prosthechea the labellum forms a "hood" over the column. This makes the flower effectively upside down, or non-resupinate. https://en.wikipedia.org/wiki/Prosthechea_cochleata #Orchids
Orchid-Mimicry of 'A Duck-in-Flight': Looking into the flower of Caleana major [Large-Duck-Orchid]. Apparently, the flowers are pollinated by male sawflies who mistake the Labellum (Duck-Head here) for a female fly. The labellum is then triggered downward, throwing the sawfly into the flower and trapping it - Flickr - Photo Sharing!
Purple Beard-orchid: A three-lipped variant of Calochilus platychilus flowering in the Peter Murrell Reserve, Tasmania, Australia. According to "Orchids of Tasmania" this species is prone to developmental errors so that the Labellum is fringed and hairy [or as in this case all the petals develop the Labellum (Lip) characteristics] - rather a cool-looking effect! There's some discussion as to whether Calochilus imberbis is a true species or just a petaloid form of Calochilus platychilus.
The Flying-Duck Orchid: Caleana major. Found in Queensland, New South Wales, Victoria, Tasmania, South Australia and New Zealand as a miniature to small sized cold to warm growing terrestrial in sand and sandstone soils in heathlands and open forests.