Milk Is Just Filtered Blood
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Female mammals make milk, a cocktail of filtered blood, to provide their babies with vital nutrients.
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To learn more, start your googling with these keywords:
Mammal: Endothermic vertebrates that nurse their young.
Lactation: The secretion of milk by the mammary glands.
Mammary Gland: A cluster of alveoli and ducts that secretes milk.
Mammary Alveoli: The tiny sacs that are the site of milk production and storage in the mammary gland.
Oxytocin: A hormone released by the pituitary gland that – among other things – causes the milk ejection reflex during nursing.
Holstein: A large black and white cow known for the large quantities of milk it yields.
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Credits (and Twitter handles):
Script Writer: David Goldenberg (@dgoldenberg)
Script Editor: Emily Elert (@eelert)
Video Illustrator: Qingyang Chen (@QCVisual)
Video Director: David Goldenberg (@dgoldenberg)
Video Narrator: Emily Elert (@eelert)
With Contributions From: Henry Reich, Alex Reich, Kate Yoshida, Ever Salazar, Peter Reich
Music by: Nathaniel Schroeder:
Skibiel, A., Downing, L., Orr, T., and Hood, W. (2013).The Evolution Of The Nutrient Composition Of Mammalian Milks. Journal of Animal Ecology. 82 (6): 1254-1264. Retrieved from:
Sharp, J., Wanyonyi, S., Modepalli, V., Watt, A., Kuruppath, S., Hinds, L., Kumar, A., Abud, H., Lefevre, C., and Nicholas, K. (2017). The Tammar Wallaby: A Marsupial Model To Examine The Timed Delivery And Role Of Bioactives In Milk. General and Comparative Endocrinology. 244: 164-177. Retrieved from:
Tsuruta, S., Misztal, I., and Lawlor, T. (2004). Genetic Correlations Among Production, Body Size, Udder,and Productive Life Traits Over Time in Holsteins. Journal of Dairy Science. 87(5):1457-1468. Retrieved from:
Nicholas, K. (1988). Asynchronous Dual Lactation In A Marsupial, The Tammar Wallaby. Biochemical and Biophysical Research Communications. 154 (2): 529-536. Retrieved from: