A full grown amazon river dolphin can grow up to 20 feet
5 tons
By "blue dolphin" I'm assuming you mean a bottlenose dolphin. Adults range between 6.6 feet (2 metres) and 13 feet (4 metres). Males are larger than females. The average length of a bottlenose dolphin is typically 8 feet.
The average length of a full grown kookaburra is 46 cm.
offsets
A full grown dolphin's length would be 7ft but there are some that have as long as up to 12ft. An estimate of weight would be around 450-600 pounds.
No
not that big!
a full grown dolphin can weigh up to 200-240 pound
Size differs by region
18
at full length about 2.6 m