For those who don't know, this is the rather spectacular crested Nyctosaurus
--a medium-sized pterosaur from the Late Cretaceous.
I did picture of this pair a few years back [link]
where I put sails on them, to go with the skim-sailing hypothesis that was so hot right then. It's not so hot right now, so this is an un-sailed version (which is based on an old painting I did at the same time, but never uploaded anywhere). I've extended the rear-facing prong somewhat, as it seems there were extra bits that weren't obvious in the original description.