Hippo Day
Hippo Day is held on February 15. This event in the second decade of the month February is annual. 
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The name comes from the ancient Greek for "river horse" (ἱπποπόταμος).
The common hippopotamus, or hippo, is a large, mostly herbivorous, semiaquatic mammal and ungulate native to sub-Saharan Africa. It is one of only two extant species in the family Hippopotamidae, the other being the pygmy hippopotamus.
Hippos bask on the shoreline and secrete an oily red substance, which gave rise to the myth that they sweat blood. The liquid is actually a skin moistener and sunblock that may also provide protection against germs.
Similar holidays and events, festivals and interesting facts
National Pet Theft Awareness Day in US on February 14
Donor Day or Organ Donor Day on February 14
Ferris Wheel Day on February 14
February Restaurant Day on February 15 (is occurs once per season. The third Saturday of February, May, August, and November);
National Justice for Animals Week in USA on February 16
World Whale Day on February 16
Innovation Day on February 16
Do a Grouch a Favor Day on February 16