If you were to go upside down into a handstand, blood pressure would momentarily increase (until the baroreceptor reflex corrects it). Why does blood pressure increase when you go upside down

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.