Squirrels hide their food in one place every time, but they never rely on memory to find food storage, but rely on smell.
The same is true for the same kind. The first time I meet the same kind, the squirrel will rely on the sense of smell to confirm the other side. When sniffing, it should be very close.
It looks like kissing. When the squirrel is encountered for the second time, they smell the smell. I know who it is.