 \Pi _ { \mathrm { e f } } \left( \sigma \right) { \cal F } \left[ h \right] = \frac { \delta { \cal F } \left[ h \right] } { \delta h ^ { \mathrm { e f } } \left( \sigma \right) } .  \giraffe\peacock \leopard \narwhal\otter\scorpion \hippo