What is the primary ecological advantage provided by the nuthatch's head-first descent foraging strategy?

Answer

It surveys downward-facing surfaces potentially missed by upward-climbing specialists

By descending head-first, the nuthatch surveys the lower portions of the trunk and downward-facing surfaces that might be ignored by woodpeckers and creepers that move primarily upward, minimizing direct resource competition.

What is the primary ecological advantage provided by the nuthatch's head-first descent foraging strategy?
taxonomybirdanimalNuthatch