>>13671773fun fact...
in one of his books (might be "menagerie manor", i forget) the zoologist gerald durrell tells the story of some birds in jersey zoo which he founded in the 1950s.
basically the birds died unexpectedly so they autopsied them and found they had died of ingesting shotgun pellets but they had not been shot- they had died of lead poisoning.
they discovered that the pellets were from some shotgun shells that someone had buried in ww2 to hide them from the nazis (the channel islands including jersey were the only part of the british empire occupied by the germans in the war). the shells had rotted over time, some of the pellets had surfaced and the birds had eaten some of them.
so basically whoever buried the shells had managed to use them to hunt birds in the future