colors '
The answer depends on what you want tell it apart from!
Cats have retractable claws, a unique feature that sets them apart from other animals.
it depends what you are telling apart
they haven't
Cats' paws have sharp, retractable claws, while dogs have hard, dull claws that don't retract.
it sucks apart from horse riding and my cats and my mates and 2 of my cats and our dog died
Fish
Yes, cats have the ability to remember their owners even after a year of being apart. They may exhibit signs of recognition and familiarity when reunited with their owner.
Meerkats tell each other apart with smell and dominant
Depends what "them" is
Dogs and cats actually do see colour but green, yellow, and orange look similar to them. Bright orange and red look dark or brown. Purple and blue are easier for them to tell apart from other colous.
As humans we have a hard time telling penguins apart. However, They can tell each other apart by distinct vocalizations.