Got some good working tests of the round trip simulation.
Got some good working tests of the round trip simulation.

I now have passing tests of a single generation with a few configurations:

* All one-year old birds, so no mating and no new birds
* All mature early nesters, so there are a few survivors in the nests where collection occurs.
* All mature late nesters, so lots of new birds are born, but none are collected.

NicMcPhee/whooping-crane-model