Call dolphins
August 15, 2014 at 17:25 clock Updated BST
One study suggested that trained dolphins marine mammals expressing joy with jubilation.
Researchers first noticed the screams when the animals with fish is rewarded for completing tasks.
A new study in the Journal of Experimental Biology published shows that these cries are after the time that produces a chemical called dopamine - are published in the brain of animals - connected with the feeling of reward.
These images, taken from the perspective of a dolphin shows animal catch a fish, and make one of those screams.
Video courtesy of Sam Ridgway, UCSD
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