It’s not just mammals that produce milk for their babies

  Pigeon: Cheese-like pigeon milk
   Pigeon milk is not the same as ordinary milk, it is not produced from the mammary glands of pigeons, but from a structure called sac. The sac is located near the pigeon’s esophagus and is usually used to store food. However, after the pigeon’s eggs are laid, a series of changes will occur in the sac of the parents of the pigeon: the epithelial cells of the sac proliferate and begin to produce a large amount of protein and fat. , they gradually fill up the pouches and turn into cheesy yellow spheres.
   This sphere is also called pigeon milk, which is not only rich in casein (the main protein in mammalian milk), but also immunoglobulin and lactoferrin, which can enhance immunity; as well as fat and various trace elements, which are beneficial to young The growth and development of birds is very important.
  Flamingos: blood-red milk When
   flamingos are just born, the filter-feeding structure of their beaks is not fully developed, and they cannot filter out small insects and shrimps in the lake water to eat, so flamingo parents are like pigeons. It secretes bird’s milk from the sac in the digestive tract for the chicks to eat. And flamingo’s bird milk is also a high-protein product, with a protein content of 9%, far exceeding that of cow’s milk (3%) and human milk (0.9%).
   But the scene of the flamingo “feeding” is a little scary, and it looks like it’s feeding blood, because the flamingo’s bird milk contains canthaxanthin (an orange-red carotenoid) and a small amount of hemoglobin, which is bloody red .
  Emperor penguins: milk dad’s condensed milk
   Female emperor penguins will return to the sea after laying eggs, replenish energy through foraging, and bring some food back to the breeding ground; male emperor penguins are responsible for incubating penguin eggs, but once the female birds return late, the emperor penguins The father penguin will feed the hatchlings alone. During the incubation period, the male emperor penguin cannot regurgitate small fish and shrimp for the children to eat. What should I do?
   Male emperor penguins also have a trick – a white condensed milk-like substance secreted from glands near the digestive tract, rich in protein and fat, to ensure that the young bird will survive the difficulties of starvation. Male emperor penguins are like a competent “daddy”, both incubating eggs and producing milk, and they are the only penguins that can secrete bird milk.
   Pacific Beetle Cockroach: Milk Crystals Inside
   Most cockroaches are oviparous animals, but the Pacific beetle cockroach is a viviparous cockroach. Its embryo develops directly in the oocyst (similar to the human uterus), and when the embryo develops to a certain stage, it will drink the oocyst secreted by the oocyst cells. “Cockroach Milk”. This kind of cockroach milk is rich in protein, fat and sugar, so that the larvae get a lot of nutrients in the mother’s body, gain weight rapidly, and develop quickly; at the same time, the breast milk is concentrated into crystals in its body, also called milk crystals, and continues to feed the larvae. After birth, cockroaches are noticeably more mature.

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