Leatherback turtle.

(From www.coral.org)

Those two are leatherback turtles and are very cute and also very threatened by extinction.
They are considered vulnerable.
The Leatherback is the largest of all living turtles. and also the fourth heaviest modern reptile behind three crocodilians.
They can grow up to 2 metres long!!
Leatherback turtles don't have a shell, they have an oily skin instead.
These reptilians are the only remaining ancestors of a family of turtles that traces its evolutionary roots back more than a million years. We should save this last ancestor from the same fate as the rest of it's family.
The leatherback turtle population is declining rapidly in many parts of the world.
Leatherbacks can dive to depths of 4,200 feet (1,280 metres)-deeper than any other turtle- and can stay down for up to 85 minutes.

(From www.becuo.com)

Leatherbacks and other turtles like eating jelly fish and often get plastic bags confused with them and the bag gets stuck in their gut.

(From tumblr)

Also they can get stuck in fishing nets.

(From www.i.telegraph.co.uk)