All animals that use their limbs for locomotion have knee joints on their hind legs, just the same as humans. Creatures without legs would also have no knees.
Some of these include:
Snakes
Invertebrates
Fish
Marine Mammals
When watching 4 footed animals it often appears that they have no knees, this is because to run fast the knee has migrated up to the top of the leg so appears to be a hip (it remains in the same place on the front limbs
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Elephants have no knees, as they have a unique stifle joint in their hind legs which is often mistaken for a knee. This joint allows for strong support and helps with their weight-bearing capabilities.
Unfortunately, you cannot physically make your knees smaller as they are a joint in your body. Your knee size is determined by bone structure and genetics. If you are concerned about the appearance of your knees, you can try exercises to tone the surrounding muscles or speak to a medical professional for guidance.
Joints make it possible for your knees and ankles to work.
When someone says their knees are like jelly, they are describing a feeling of weakness or instability in their knees, often due to fear, shock, or extreme nervousness. It implies that their knees feel wobbly and unreliable, as if they might give out.
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Joints are found in the: Shoulders Knees Elbows Wrists