The new variety has a
narrower, more pointed head, ideal for nibbling insects and larvae from
crevices in the volcanic rock, and fat lips to cushion its ventures
into these sharp - edged fissures.
As Carter Radcliff has noted in 2010, «Between these closely clustered forms are
narrow crevices, some of them so deep and intricate that it is impossible to see all the way
into them.»