Also with a short detour off track ...
perhaps further birds discussion should be in the gardening thread
Housemartins nest on my house and soon they will fly off to somewhere in Africa and the young birds have obviously never been there. They have built a mud nest and re-use it each year. My car is parked under their flight path to and from the nest and I'm forever cleaning off what they drop on it.. Each winter I think about poking down the nest but never do and suppose it is just as much their world as it is mine ...
Back on track, I note that the Artemis program is expected to have an ultimate price tag of $93 billion ...