Rhynchokinesis in the Common Snipe

posted in: Morphology-Develop., Waders | 5

“I am grateful to Hans Peeters for pointing out a feature I saw but had not recognised – Rhynchokinesis. When I posted a video of a Common Snipe (Gallinago gallinago) HERE (see second half of the video for the behaviour), Hans commented: ‘Amar, you didn’t point out the best part – that in your wonderful little video one can clearly see how the TIP of the maxilla (upper mandible) can be raised or flexed upward, independent of the rest of the bill. A perfect alligator forceps for grabbing worms and such buried deep in the mud. Very nice, and rarely demonstrated!’

“Rhynchokinesis is the ability possessed by some birds to flex their upper mandible and is associated with the ‘deep probing feeding method’. See examples: HERE.

“For the snipe, this allows it to open just the tip of its bill, when the bill is stuck in the mud foraging. An elegant mechanism to get prey.

“More scientific details in this article: Sora M. Estrella, José A. Masero. The use of distal rhynchokinesis by birds feeding in water. The Journal of Experimental Biology 210, 3757-3762, 2007 LINK.

Dato’ Dr Amar-Singh HSS
Ipoh, Perak, Malaysia
2nd March 2013

Location: Malim Nawar Wetlands, Perak, Malaysia
Habitat: Extensive ex-tin mining area with pond/lakes, wetlands, fish farming

5 Responses

  1. Thanks for sharing this rarely seen ability of the mandible being flexed. Have not seen anything like this. Still lots to learn about birds. :)

  2. […] Dato’ Dr Amar-Singh HSS’s earlier post on the Common Snipe (Gallinago gallinago) with a video clip showing the bird preening an feeding in shallow water HERE attracted the attention or another birder who pointed out to him the phenomenon of rhynchokinesis. This in turn led Amar posting another account, illustrated with images of the phenomenon HERE. […]

  3. […] birding community by Dato’ Dr Amar-Singh HSS of Malaysia (below). This is where photography LINK and videography LINK have proved to be useful tools in […]

  4. […] “They were very reminiscent of the snipe I posted much earlier that demonstrated rhynchokinesis, except here there is no apparent flexing of the upper mandible LINK. […]

  5. […] Our introduction to rhynchokinesis was based on the feeding behaviour of the Common Snipe (Gallinago gallinago) that was sent in by Dato’ Dr Amar-Singh HSS LINK 1 and LINK 2. […]

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