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Cheek pouches are pockets on both sides of the head of some mammals between the jaw and the cheek. They can be found on mammals including the platypus, some rodents, and most monkeys, [1] [2] as well as the marsupial koala. [3] The cheek pouches of chipmunks can reach the size of their body when full.
However, it returns to the pouch to sleep, and if danger threatens, it will seek refuge in its mother's pouch for safety. An early birth removes a developing marsupial from its mother's body much sooner than in placentals; thus marsupials have not developed a complex placenta to protect the embryo from its mother's immune system. Though early ...
Female koalas have been described as having a ‘backward-opening’ pouch like wombats, as opposed to an upward-opening pouch like kangaroos, but that is not true. When a female koala gives birth to young her pouch opening faces neither up nor down, although it is located towards the bottom of the pouch rather than at the top.
By the time the center closed in 1986, the 1,063 female beagles had been exposed to radiation, while many more dogs passed through the facility for breeding and as control subjects. [ 2 ] In the 1990s, the remains of 800 irradiated dogs, their toxic feces, and contaminated gravel were dug up, put in metal drums, and sent to a nuclear disposal ...
In an example of convergent evolution, the southern marsupial mole resembles the Namib Desert golden mole (Eremitalpa granti namibensis) and other specialised fossorial animals in having a low and unstable body temperature, ranging between 15–30 °C (59–86 °F). It does not have an unusually low resting metabolic rate, and the metabolic ...
The human body contains many types of cells and a human can be killed by the loss of a single tissue in a vital organ [citation needed]. For many short term radiation deaths (3 days to 30 days) the loss of cells forming blood cells (bone marrow) and the cells in the digestive system (wall of the intestines) cause death.
The climbing ability would have also helped them climb out of caves, which could therefore have been used as dens to rear their young. [30] Specialised tail bones called chevrons strengthened the tail, likely allowing the animal to use it to prop itself up while rearing on its hind legs, which may have been done when climbing or attacking prey.
The body cavity is a haemocoel, an open circulatory system, filled with a colourless fluid. The body covering is a cuticle that is replaced when the animal moults; it contains hardened (sclerotised) proteins and chitin but is not calcified. Each leg ends in one or more claws according to the species; in some species, the claws are modified as ...