There is a Gypsy taboo against eating what animal which forms an important part of Gypsy culture?

pch: Horse Owls are considered portents of death, just as with many non-Gypsies. Among some Gypsies, the owl's cry is considered very bad luck. For this reason, owls are never eaten. The German Sinti consider eating horse flesh a serious offense, as do other Gypsies. The exclusion of horse meat has more to do with respect than to superstition, as the horse has been so important to the Gypsies' mobility and survival in the past.