Helper/Aunt Vixens

 

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I've mentioned "Aunt" foxes before and how foxes living in a leash (a family group) help vixens out with cubs. Here is an explanation of one way they do that.

Vixens (female red foxes) acting as wet nurses is a phenomenon known as alloparenting or "helper" behavior—often occur in social groups where young females (typically daughters from the previous year) stay with the breeding pair to help raise the new litter. The hormonal mechanisms driving this behavior involve the same hormones responsible for biological motherhood, primarily prolactin and oxytocin, often stimulated by the presence of cubs and social factors.

Here is the breakdown of the hormonal role:

• Prolactin (The "Mothering" Hormone): High levels of prolactin are essential for initiating and maintaining lactation in mammals. In sub-dominant helper vixens, the presence of kits and the social structure of the den can trigger increased prolactin production, enabling them to produce milk even if they have not given birth themselves.

• Oxytocin (The "Let-Down" Hormone): This hormone triggers the contraction of mammary glands, ensuring the expulsion of milk during nursing. It is released in response to the tactile stimulus of nursing (suckling).

• Alloparental Lactation Stimulation: The "helper" vixen may be induced to lactate by the high levels of progestin (progesterone) and estradiol during the breeding season, coupled with the stimulation of seeing or caring for the cubs.

• Behavioral & Hormonal Bonding: The act of grooming, hugging, and sitting with the cubs is crucial for bonding and potentially triggers the necessary hormonal responses, including a decrease in the stress hormone cortisol, which helps the vixen feel comfortable nursing, even if they aren't the primary mother.