The rare feline phenom -- which is often referred to as a Janus cat -- was part of a litter of six kittens that popped out in Albany on Wednesday, and the owner, Kyla King, noticed one of them had two mugs on one giant head. She named the kitty Biscuits and Gravy.

Kyla and her family documented B&G's development over the next few days, showing off their attempts to feed the kitten -- which proved incredibly difficult, on account of it being able to feed itself out of both faces -- as well as it playing and napping with its siblings.

The owners say Biscuit (its short name) was actually able to eat pretty decently, but he simply wouldn't grow ... and had trouble carrying its head, which was too big for its body.

In the end, the cat died of natural causes -- with Kyla writing ... "This photo was taken about an hour before Biscuits died. Kyla gave up 3 1/2 days of her life to put all of her efforts into saving him. He was born with the longest of odds and by living nearly 4 days, he beat those odds."

She added, "We thank all of you who have been so kind, prayed, and wished the best for Biscuits and Gravy. So many of you care and wanted to follow his progress, and said some very nice things to and about us. We will never forget your kindness!"

It's not uncommon for Janus cats like these to have short lifespans -- they simply have too many internal complications for prolonged good health. One exception though ... 15-year-old Frank and Louie, AKA Frankenlouie. He toughed it out for a long time, and died in 2014.