The pygmy nuthatch is long and with a wingspan of , and weighs . Six
subspecies are currently accepted; some older texts accept a seventh,
S. p. chihuahuae. •
Sitta pygmaea melanotis Van Rossem, AJ, 1929. Southwestern Canada south through interior western USA to northwestern Mexico; syn.
S. p. chihuahuae van Rossem, 1929. •
Sitta pygmaea pygmaea Vigors, NA, 1839. Central California coast. •
Sitta pygmaea leuconucha Anthony, AW, 1889. Southwestern California coast. •
Sitta pygmaea brunnescens Norris, RA, 1958. Southwestern Mexico. •
Sitta pygmaea flavinucha Van Rossem, AJ, 1939. East-central Mexico. •
Sitta pygmaea elii Phillips, AR, 1986. Northeastern Mexico. This species is very similar to the
brown-headed nuthatch of the
southeastern United States; their ranges have no overlap. Brown-headed nuthatch differs in having an orangey-brown (not grayish) cap, a more obvious white spot on the nape, and less white in the tail. ==In popular culture==