Depends what "them" is
The answer depends on what you want tell it apart from!
it depends what you are telling apart
Meerkats tell each other apart with smell and dominant
As humans we have a hard time telling penguins apart. However, They can tell each other apart by distinct vocalizations.
For the average human viewer there appears to be little way to tell a Pill Bug apart but they do have markings on there backs which can allow them to be told apart.
I can tell them apart by their hairstyle and attitudes (including their music). Maybe you should try the same.
You can tell it apart by Eating the burger and licking the rockdifferent taste s LIKEa BOSS
colors '
Apart from that, I couldn't tell you. The tow truck will pull the cars apart from each other.
to tell them apart from other
So you can tell them apart.
to tell us all apart