It's just there way of saying 'So long and thanks for all the fish'.lol.
First thing I thought of was a cat bringing dead mice back for it's owners and they did say it felt similar.They did highlight the fact it was
significant as the dolphins are wild animals but can anyone claim that cats are truly domesticated.They just let us think that and use us while it
suits them !!
Does it suggest that dolphins may see mankind as on a similar standing to themselves.i.e you don't choose to gift food to another creature if you see
it's place in your world as much d superior or inferior.It does hint at a level of trust and feeling well disposed to the humans they gave the gifts
Then again should we be assigning 'human' sentiments and feelings on them when clearly they're not human.It's hard not to with some particular
animals like dogs,apes,whales and dolphins as they seem to possess character,express an intelligence that makes them appear to be highly aware,to show
Maybe they are more sentient than we credit them to be.
The relationship between man and dolphin may give an insight to how it'll be when we make contact with e.t.
We being a land creature them aquatic we are in a real sense from different worlds or dimensions where we can move between both while they are limited
to the water.
Generally we've viewed them as a smarter mammal that can perform tricks and acrobatics,that's friendly and intelligent.
By our own low standards we've,on the whole,not treated dolphins badly like we have whales and sharks or almost every creature thats walked on
land.If you put aside tuna nets and the military trying to turn them into living torpedos.
Maybe e.t will allow the more acrobatic of us to live an ok life performing in the circus for them and talking of us as if we had a glimmer of
intelligence in a very limited 'human' way