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There is no good answer! The biodiversity shows so much examples of wonderful adaptions to challenging environments!
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Do you want to see some pictures of cardiovascular physiology animals?
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Do you still think that human is a special animal?
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Do you want to know how animals cope with gravity?
Kangaroos are bipeds, but their tail helps a lot. They are more vertical tripeds.
Bats are head-down (!) vertical bipeds
All the birds are bipeds! But their body is horizontal. Parrots are vertical bipeds in the trees... and horizontal ones when they walk on the ground
Giraffes are the tallest land living animal. The most impressive gravity challenge for the cardiovascular system: the giraffe heart has to push blood along an incredible long neck to reach the very high brain
Penguins are true vertical bipeds
Gerbils are like kangaroos, more tripeds than bipeds. Moreover, other small rodents like mouse and hamsters adopt erect posture while holding food in their arms
Rats are quadupeds. But they spend most of their time to explore their environment. About 15% of this time include erect posture.
Some snakes are tree-climbers, others are ground only snakes and others are water snakes. Three very different situations that illustrate the adataption of a “tubing” to gravitational challenge
Some lizards are known to run on their two back legs including in water. But lizards may also live in a vertical world (like a wall). Then, the position of their heads is quite random including the vertical one
Octopus have been seen walking on two of their tentacles disguised as coconuts (published in a very serious scientific journal: Science)
Some people think that the human ancestor is not a ape like quadruped but rather a sea vertical animal looking like sea horses
The deap sea environment involved so high pressures that arteries of the whales (or other sea mammals) are collapsed. Fortunatelly the arteries that supply the brain go through the vertebra bones protecting them against the environmental high pressures
Apes are quadrupeds. They move by knuckle walking or brachiation. But they are also occasional bipeds
The Noah's ark of cardiovascular physiology animals Here are some examples of animals that provide (or might provide) interesting or funny insights on standing cardiovascular physiology in humans. They are interesting because of their upright posture, because of their bipedalism (occasionally or continuously), or because gravity or fluid shifts are a challenge for their cardiovascular regulation. One of them should not be here: which one? (click on it to check your answer and to get a comment about it, or click here to directly get the right answer!)
Some animals like marmots and meerkats adopt erect posture to peer across the landscape
Some bugs (scarite) faint when disturbed. That is strange because there is no true cardiovascular system in bugs (fainting is supposed to be a cardiovascular collapse)
Dormouses faint when in danger, like in front of a predator. That is not so bad because predators are not interested in what is looking like a dead body: they are not vultures
Bears stand-up occassionaly. Then they are bipeds standing on their foot soles exactly like humans
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