Between 1993 and '97, the Philippines issued small-sized, domestic rate sheets of stamps depicting various "National Symbols", such as the flag, tree, fruit, bird, and others (17 total, I believe). Usually, the vignette stayed the same as the postal rate changed. Here are two different views/vignettes of the "kalabaw" (English = carabao), one is from 1994, and the other from 1996. The 1996 stamp has a gold foil overprint inscribed "100 kalayaan" indicating the centenary of independence from Spain.
There seems to be some disagreement about the "kalabaw" being the national animal. From Wikipedia, "The carabao is a domestic, swamp-type water buffalo (Bubalus bubalis) native to the Philippines. Despite the popular notion that this bovine has been declared as the national animal of the Philippines, the National Commission for Culture and the Arts of the Philippines has stated that this is not the case as it has no basis in Philippine law."