In wooded areas across Australia, tree hollows house the nests of some of the most elusive and adorable baby birds. Spotting one of these little white chicks with unique hairdos is rare for even the ...

observed the birds’ behavior in 2014 in Amsterdam, where she lives. “The poor warbler almost disappears in the wide-opened mouth of its ‘adopted’ baby,” Slothouber says. And yet “the ...