The other one that amazes me is the Petrel family, that digest fish and process oil from them and store it in their foregut. This allows them to fly long distances - like, Falkland Islands to Svalbard kind of distances - without really stopping.
The thing that gets me about it is they brew this fish oil into something with the energy density of *diesel* that they can then digest, and I have this mental picture of some kind of Endura-DI Shearwater flapping, clattering and smoking, all the way across the Atlantic in search of its breeding grounds...
The thing that gets me about it is they brew this fish oil into something with the energy density of *diesel* that they can then digest, and I have this mental picture of some kind of Endura-DI Shearwater flapping, clattering and smoking, all the way across the Atlantic in search of its breeding grounds...