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!
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
Caladenia carnea - Lady-Finger Caladenia - This is a deciduous terrestrial orchid. Caladenia carnea grows in open eucalypt forests where the grass is sparse. The single leaf grows to 15cm by 3mm and while looks like grass can be differentiated as it is quite soft. The flower stem grows to about 20cm with one or occasionally two flowers. The flowers are to about 20mm across and are generally pink but commonly white or any shade of pink. The labellum and column have transverse purple stripes.
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 mutant-form of Calochilus platychilus