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*** Rainfall
 
*** Rainfall
 
*** Food availability.
 
*** Food availability.
* A variety of sensory receptors detect these cues, including the eye, [[Endocrine_System_-_Pineal_Gland_-_Anatomy_%26_Physiology|pineal gland]] (an organ in the dorsal part of the [[Forebrain_-_Anatomy_%26_Physiology|forebrain]] that is sensitive to light), olfactory organs, taste buds, and thermoreceptors.
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* A variety of sensory receptors detect these cues, including the eye, [[Endocrine_System_-_Pineal_Gland_-_Anatomy_%26_Physiology|pineal gland]] (an organ in the dorsal part of the [[Forebrain_-_Anatomy_%26_Physiology|forebrain]] that is sensitive to light), [[Special_Senses_-_Olfactory_-_Anatomy_%26_Physiology|olfactory organs]], taste buds, and thermoreceptors.
 
* The hypothalamus, located at the base of the brain, is sensitive to signals from sensory receptors and releases gonadotropin releasing hormones (GnRH) in response to environmental cues.
 
* The hypothalamus, located at the base of the brain, is sensitive to signals from sensory receptors and releases gonadotropin releasing hormones (GnRH) in response to environmental cues.
 
* GnRH travels from the hypothalamus to the pituitary gland.  
 
* GnRH travels from the hypothalamus to the pituitary gland.  
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