The death of David "Davy" Crockett at the Battle of the Alamo (6 March 1836) has been understood as a heroic last stand at least since 1880 when Texan historian Reuben M. Potter dismissed eyewitness...
There's a good article in #RNZ today about the passing of birding legend #DavidCrockett. David's determination and dedication led to the rediscovery of the Chatham Island tāiko in 1978. That's an endemic NZ seabird that had been considered extinct since it had last been seen in 1867. Now it's increasing.
When species become very rare, the actions of single people can make a huge difference to their survival.