Death by Symbolism
In the design, there's 16 symbols of death. 8 of them are animals; Owl, Vulture, Jackal, Bat, Crow, Cat, Heron, and Moth. The other 8 symbols include, The Grim Reaper, a black feather, an arrow, a black rose, an upside-down torch, a coffin, an ace of spades, and the skull. At some point in time, whether currently or in the past, these 16 symbols have been associated with death.
Note - The type on the mock-up above just explains where everything is located, it wouldn't be on the printed shirt.
Thanks for looking!