What species of big cat is the most agile?

It's difficult to definitively crown one big cat as the most agile, as agility involves a combination of factors like:

* Flexibility: How easily can they move and change direction?

* Strength: How powerful are their muscles for jumps and leaps?

* Balance: How well can they maintain control in mid-air or on uneven terrain?

That being said, the cheetah is often considered the most agile big cat due to its:

* Exceptional speed and acceleration: It can reach speeds of over 70 mph (110 km/h) in just 3 seconds, making it the fastest land animal on Earth.

* Flexible spine: Their flexible spine allows for incredible flexibility and turning ability.

* Powerful legs: Their long, powerful legs help propel them forward with incredible force.

While cheetahs are exceptional sprinters, smaller cats like the serval and the caracal are also known for their agility. They are capable of incredible leaps and are adept at navigating dense vegetation.

Ultimately, it's a matter of perspective and what aspect of agility you prioritize. The cheetah excels at pure speed and agility for short bursts, while other cats like the serval demonstrate impressive agility in different environments.