Pygmy hippopotamus unusual secretion as common hippos, that gives a pinkish tinge to their bodies, and is sometimes described as "blood sweat" though the secretion is neither sweat nor blood. This substance, hipposudoric acid, is believed to have antiseptic and sunscreening properties. The skin of hippos dries out quickly and cracks, which is why both species spend so much time in water. The skeleton of "C. liberiensis" is more gracile than that of the common hippopotamus, meaning their bones are proportionally thinner. The common hippo's spine is parallel with the ground; the pygmy hippo's back slopes forward, a likely adaptation to pass
Kozlov's pygmy jerboa April and May and the litter size averages three to five young. Kozlov's pygmy jerboa has a wide range and is a common species in suitable habitat. The population trend is not known but it is presumed to have a large total population and is present in several protected areas. No specific threats to this jerboa have been identified, and the International Union for Conservation of Nature has assessed its conservation status as being of "least concern". Kozlov's pygmy jerboa Kozlov's pygmy jerboa ("Salpingotus kozlovi") is a species of rodent in the family Dipodidae. It is found in northwestern China