An animal's multiply_value affects the value of animal products such as meat, raw hides, silk thread, and anything made from these raw materials, including leather or silk clothing. While it's possible for multiply_value to apply to only specific parts of a creature, all non-modded creatures have use SELECT_MATERIAL:ALL, so all parts of the animal are multiplied.
||Elephant, Sea serpent, Sea monster, Giraffe, Rhinoceros
||Giant eagle, Voracious cave crawler, Jabberer, Cave dragon, Giant lion, Giant leopard, Giant jaguar, Giant tiger, Giant cheetah, Giant desert scorpion, Unicorn, Cave crocodile, Giant toad, Giant olm, Giant bat, Giant cave spider
||Grizzly bear, Alligator, Lion, Leopard, Jaguar, Tiger, Cheetah, Saltwater crocodile, Polar bear, Elk bird, Green devourer, Rutherer, Draltha, Blind cave bear, Yeti, Sasquatch, Fire imp
||Black bear, Cougar, Wolf, Muskox, Elk, Magma crab, Helmet snake, Giant earthworm, Molemarian, Ice wolf, Beak dog, Strangler, Giant rat, Giant mole, Purring maggot, Giant cave swallow, Panda, Capybara