Dolphins are incredibly social animals.
They always swim in pods and some species will spend
their entire life with their family.

Dolphins are known to swim with not only their own kind
but also other species of dolphins and even completely different animals.
They are even known to come up to humans in the wild.

Bottlenosed dolphins and whales socializing
in captivity and the wild.

Three different dolphin species
travelling together.

Mating

Mating is very important to dolphins and
along with humans and apes they are the only animals that
do not only mate when they are in heat, but constantly.
Dolphins often socialize by mating.

When mating dolphins will stroke and rub eachother with
their fins and beaks and their typical mating position is
faced towards eachother.

When giving birth a female will always get assistence
from another dolphin that has the 'auntie' position.
The auntie will also look after the calf when the mother needs to
rest/eat. Even dolphins of a different species sometimes play the role of auntie
within a pod.

Dolphins will take care of their podmembers, even when these
are albino or different in any way.

They will never abandon a wounded podmember, something hunters take
advantage of by stabbing a dolphin to keep the whole pod around.