big
450 pounds
not much if it's a baby
It depends on the dolphin breed. Sorry I couldn't be very specific.
A baby dolphin weigh about 300 pounds
they weigh about 30 -90 lbs at birth
It is called a dorsal stripe, like a dorsal fin on a dolphin.
19 tonne.
It depends on what type of dolphin.
5 tons
Because it has a stripe on its head that is darker than its body.
They vary in weight greatly - from 10kg, up to 10 tonnes (which is 10000kg). But since I presume you're asking for the common dolphin - a common dolphin can weigh up to 75 kg.