why do flamingos stand on one foot?
552465
To conserve body heat and energy.
16480
wow, those are some immature answers. Zebras have stripes for defense tactics. When they huddle together or move together, it is hard for a predator to single out one.
862514
A "hallux" is the first or inermost digit on a human's (er primate's, or whatever) foot... as in, your big toe. I think in birds, the hallux is the one toe that points backwards. But ostriches don't have one of those things... They just have two toes.
1025606
One pair, so two scaled wings.
420923
It's not so much that a bat has to hang upside down, some bats, such as the famous vampire bat, are quite good at moving around on the ground using their feet and wings as locomotory limbs.\n\nMost bats have developed adaptations that allow them to hang upside down easily.  The tendons and ligaments in their feet are arranged in such a way that their natural position is 'flexed'.  It actually takes deliberate effort for them to let go with their feet.  So when they wrap their toes around a branch, or hook their claws on a crack or crevice in the rock, they can rest and even sleep without fear of falling off.  Their feet are locked in place.\n\nMost bats have their feet pretty much turned around, so that if they were lying down, the soles of their feet would point up.  This makes roosting and even catching flying prey easier, but makes walking somewhat ackward.  While they can do it if they really need to, they usually don't.  Sort of like a human crawling on their hands and knees.  We can do it, but it's not really what our limbs are adapted to do.
454243
Your bones are too dense. \n\nNo joke, the reason birds are capable of flight is due to having hollow bones, making them far lighter.
231459
I always have to stand up on them, on one foot.
919089
When you walk, have the bottom of your chin parallel to the ground.
304885
Star fish have five *arms* (or, sometimes, multiples of five or six arms).  Their legs are called "tube feet" and are found in the grooves under the arms.  They have an even number of them!\n\nMost animals have an even number of legs because they are symmetrical along a single axis, so both sides end up looking the same.  The only way to have an odd number would be to not be bilaterally symmetrical (and the only animals who aren't don't have legs!) or to have a leg in the middle, which wouldn't be much use.\n\nThe only "exception" to this would be an insect-like animal called the springtail.  It's not really a leg, but they do have their abdomen bent over and underneath them.  They use it to spring very high into the air, so you could call it a leg of a sort.  Sprintails are neat.  They are very common, but most people never notice them because they are mostly quite small.
776602
i watched a tv program on this about birds that swarm and its all to do with a few factors ie all the birds are equal distance apart for flying purposes . no bird wants to be on the outside of the swarm or flock due to predator that target such swarms "falcons". so if you can visualise a bird has to have a zone around it to fly and it don't want to be on the edge.when the bird  near it moves to the centre of the swarm to stop being on the edge.the new bird that's exposed whether it be from the side above or below that bird will then move to gain cover in the swarm.hence the shapes you get and the sudden change in direction of the swarm you see in the sky.there is a a computer graphic program that runs this formula but i don't were to tell you to go for this.
1093612
The left foot  goes behind.
122696
coz they are taller comparitively
568195
because we evolved to be best at surviving, so having two arms on one side would not aid survival at all. what a stupid question! you are trying to make an intelligent point but you just sound really stupid!!
594696
Assuming you mean - in general why do elephants testis etc. not hang away from their body.\n\nThe answer is basically because it prevents them from being damaged while walking (being dragged), or from predators leaping up towards the animal.\n\nBecause we stand on two legs we're more readily prepared to fight whatever comes at us from the front.\n\nOther animals on fours have no underbelly protection so they pull in the testis in an adaptive way which basically protects their species ability to reproduce.\n\n\n----\nHope this helps you.\nEnjoy zoology, I hear it's terribly hard.
539287
wtf? this does not make sense. they stand anywhere
246158
Because they're so tall, they need something to reach the ground.\nBy the way, their trunk is more of a fusion of their nose and upper lip, I believe.
764610
Penguins have extremely tough feet to start with for walking across rocky beaches. They also have what is known as a counter current heat exchange system. The feet dont have any muscles in them, or very few, but they do have a lot of tendons so they can still move them. Not having the muscles there mean that they feet dont have to stay as warm as the rest of the body, so they will be cooler than the rest of the penguin. The counter current system means that warm blood in the veins coming from the body to the feet passes really close to the vessels carrying colder blood from the feet. As they pass close to each other, the heat from the warm blood gets transferred to the cooler blood warming that blood and cooling the warm blood so not that much heat is lost thorugh the feet, even though they are touching ice and snow all the time. This also means that the colder blood doesnt shock the body and with less of a gradient betweent he feet and the environment, the heat is lost slower than if the difference between the foot temp and the ice was greater. All of this keeps the feet cooler but not freezing. What also helps is the tough scaley feet that i mentioned earlier as well as the ability to cover the feet with essentially belly fat rolls when not walking and penguins reduce the amount of surface area in contact with the cold area by standing on their toes or rolling back onto their heels. All these things help penguins maintain a much warmer body temperature than their surroundings. \nAs a side note, the feet are also the penguins way of staying cool. Since they rest of the body is so well insulated, they can actually overheat and the feet is where the excess heat is lost, also though a counter current system.