[3] M. harrisoni is a medium-sized bat ( 12.6g males, 10.9g females) with an extremely long rostrum, small rounded ears, and a short tail.

[4] Neotropical nectar-feeding bats comprise approximately 40 species that differ widely in their dependence on a diet of nectar.

[5] The northern clade is restricted by the Sierra Madre mountain range along the Pacific coast of Mexico.

[4] The pollen collected on the hair of M. harrisoni when feeding is usually eaten as one of the only reliable nitrogen sources for the bat.

[6] Many other nectarivores shift their main diet from nectar to fruits or insects for part of the year however M. harrisoni is unable to do this due to their long jaws.

[7] Based on 84 pollen findings, M. harrisoni visited at least 14 pollen-producing plant species during an annual cycle.

Females caught between July and September showed no signs of advanced pregnancy or lactation, so M. harrisoni seems to reproduce during the dry season and only once a year.

[4] In spite of an obviously variable floral resource environment, M. harrisoni was a year-round resident in the study area, which might be also related to its body size.

Migrations following regional nectar availability (Fleming et al. 1993)[8] are known so far only from larger glossophagine species such as Leptonycteris, Choeronycteris mexicana, and to a lesser extent, Anoura geoffroyi[9][10][11] Since Musonycteris harrisoni feeds on nectar it has developed some special adaptations.