Risso’s Dolphin (Grampus griseus)
Description: This is a more 'barrel-shaped'
dolphin with a large blunt head and no beak. Risso's Dolphins
vary in colour from blue-grey, grey-brown or almost-white,
depending on age and injuries. Scars from other male Risso's
Dolphins can often be seen, dark on lighter individuals
and light on darker individuals. The mouth slants upwards
and there are seven or fewer pairs of teeth at the front
of the lower jaw. The dorsal fin is tall and curved, with
a distinct point at the tip, rather like the flippers. The
tail stock is thick and ends in powerful flukes. Risso's
Dolphins measure between 2.8-3.85m in length, and they can
weigh as much as 500kg.
Food & Feeding: The main prey is squid and octopi but
they are also known to take fish.
Behaviour: Risso's Dolphins are usually seen in groups of
3-50 animals. They often surface leisurely side-by-side
in a form of 'chorus line' but when moving quickly are aerial
acrobats and often breach, bowride and 'porpoise'. Risso's
Dolphins create a series of varying sounds including signiture
whistles. Mass and individual strandings are not uncommon.