The segregation in animals is a fundamental topic in wildlife research and conservation policy. It was studied early on within 'deer' (ungulates) and how males and females use space and habitat in different ways. Often, they are not even overlapping, and for parts of the year they may even be treated perhaps as different species ? 

Here I discuss some key citations and the concept, using sexual segregation, and then extend the concept to birds such as White-naped Cranes from Mongolia and how those species use space and home ranges in different ways, e.g. by age class, subadults vs adult and failed nesters.

It's clear that the subject is complex, with research ongoing, but that the conservation law and policy has not really implemented it, yet and that thus, the species - many of them hunted or affected  by humans - are not so well and precisely managed.

Citations:

Bowyer T.R. (2004) Sexual Segregation in Ruminants: Definitions, Hypotheses, and Implications for Conservation and Management, Journal of Mammalogy  85: 1039–1052, https://doi.org/10.1644/BBL-002.1

Kie J.R. and R. Terry Bowyer (1999) Sexual Segregation in White-Tailed Deer: Density-Dependent Changes in Use of Space, Habitat Selection, and Dietary Niche, Journal of Mammalogy  80: 1004–1020, https://doi.org/10.2307/1383271.

Li, Z., Z. Jiang (2007) Sexual segregation in Tibetan gazelle: a test of the activity budget hypothesis. Journal of Zoology  274: 327-331. https://doi.org/10.1111/j.1469-7998.2007.00388.x

Ruckstuhl K.E.  and P. Neuhaus (2002) Sexual segregation in ungulates: a comparative test of three hypotheses. Biol Rev Camb Philos Soc 77:77-96. doi: 10.1017/s1464793101005814.

Wearmouth W.J. and D.  W Sims (2008) Sexual segregation in marine fish, reptiles, birds and mammals behaviour patterns, mechanisms and conservation implications. Adv Mar Biol 54:107-70. doi: 10.1016/S0065-2881(08)00002-3.

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