The answer depends on whether we're considering land animals, birds, or all animals.
Longest Legs Among Land Animals
The giraffe possesses the longest legs among land animals. Their legs can measure an impressive 1.8 to 2.1 meters (six to seven feet) in length. [Source: How It Works, Born Free, Quora] These incredibly long legs allow them to reach heights of up to six meters (20 feet) and sprint at speeds of up to 60 kilometers (37 miles) per hour. Their leg structure is unique, with front and hind legs working in pairs during galloping. [Source: Quora]
Longest Legs Among Birds
The Secretarybird holds the record for the longest legs among birds of prey. This tall raptor has remarkably long, stork-like legs that are feathered from the thigh to the foot. [Source: The Peregrine Fund, Quora]
Longest Legs Relative to Body Size
While the giraffe has the longest legs overall on land, the serval boasts the longest legs relative to its body size among cats. Its proportionally long legs and neck earn it the nickname "giraffe cat". This adaptation allows it to excel at hunting by easily peering over tall vegetation. [Source: Milwaukee County Zoo, Reddit, Dakota Zoo]
Other Considerations:
It's important to note that the "longest legs" can be interpreted in different ways: absolute length, length relative to body size, or even leg span in the case of some invertebrates. The Japanese spider crab, for instance, has incredibly long legs, but its overall size and leg proportion differ significantly from mammals and birds. [Source: Monterey Bay Aquarium]
