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. Author manuscript; available in PMC: 2012 Jun 1.
Published in final edited form as: Pediatr Clin North Am. 2011 Jun;58(3):637–647. doi: 10.1016/j.pcl.2011.03.003

Table 2.

Mammals with a Juvenile Phase Delay1

Species Amount of Delay Rhythms Delayed Sex Difference
Human
(Homo sapiens)		 1 – 3 h Sleep, melatonin Males > females
Rhesus monkey
(Macaca mulatta)		 2 h Activity Only females
studied
Degu
(Octodon degus)		 3-5 h Activity, sleep(?) Males > females
Laboratory rat
(Rattus
norvegicus)		 1-4 h Activity Males >females
Laboratory mouse
(Mus musculus)		 1 h (?) Activity, corticosterone Only females
studied
Fat sand rat
(Psammomys
obesus)		 0-3 h to 10-14 h
(photoperiod
dependent)		 Oxygen consumption,
temperature		 Sex unspecified
1

See Hagenauer et al.26 for more information about these adolescent phase delays.