Humans wiped out a native San Francisco butterfly. Now another species is filling its 'big blue shoes'

For decades, conservationists have been restoring the biodiversity of San Francisco's coastal dunes. But a key piece of the puzzle was missing — until now.

For decades, conservationists have been restoring the biodiversity of San Francisco's coastal dunes. But a key piece of the puzzle was missing — until now.

For decades, conservationists have been restoring the biodiversity of San Francisco's coastal dunes. But a key piece of the puzzle was missing — until now.

Radio/As It Happens