Cranes and herons and the type always made me think of pterodactyls (why on earth is it spelled that way???) Birds really are amazing creatures, for all their delicate hollow bones and feathers, they really are tough and resilient.
Actually all of nature is. In the great lakes area, there is a sort of crisis because of zebra muscles (and quaga muscles which are bigger and reside at a deeper depth than zebra muscles) They are eating much of what used to be eaten by smelt, and other small fish. Also carp are aggressive eaters and are hogging the smelt et al.... So trout and salmon do not have the food base they used to. Trout and salmon are the major sport fish on lake Michigan. There is an invasive species of bottom feeder , Gobi's that were becoming abundant because nothing was eating them. Then a few years ago fishermen started finding them in the stomachs of trout and salmon. (I did too). It may not be enough, but it certainly helped stabilize the trout and salmon population. There are other factors too, like dwindling areas they can successfully spawn and such.