Monarch Butterfly Biosphere Reserve
... that anywhere from 60 million to 1 billion monarch butterflies spend the winter at the Monarch Butterfly Biosphere Reserve in central Mexico?
... that anywhere from 60<span id="mwCNc" typeof="mw:Entity"> </span>million to 1<span id="mwCNg" typeof="mw:Entity"> </span>billion <a class="mw-redirect" href="./Monarch_(butterfly)" id="mwCNk" rel="mw:WikiLink" title="Monarch (butterfly)">monarch butterflies</a> spend the winter at the <b id="mwCNo"><a href="./Monarch_Butterfly_Biosphere_Reserve" id="mwCNs" rel="mw:WikiLink" title="Monarch Butterfly Biosphere Reserve">Monarch Butterfly Biosphere Reserve</a></b> in central <a href="./Mexico" id="mwCNw" rel="mw:WikiLink" title="Mexico">Mexico</a>?