An investigation has been launched after two endangered New Zealand dolphins (also known as Hector's dolphins) were found in different locations on the country's South Island.
The growing numbers of dolphins and porpoises washing up dead on the south west coast of the UK is continuing to cause concern.
Over 100 have been reported dead on beaches in Cornwall and in fishing boat nets in eight weeks, according to the Cornwall Wildlife Trust, bringing the toll for last year to 205.
Sri Lanka Fisheries Minister, Mahinda Amaraweera has ordered the Sri Lankan navy and coastguard to take legal action against fishermen killing dolphins and small whales in the waters off Mirissa, southwest of the island. He has also instructed police to arrest those found selling whale or dolphin meat at local markets.
WDC is extremely concerned after two North Atlantic right whales were found dead and a third had to be rescued after getting caught up in fishing gear in recent days.
Only around 500 of the endangered creatures survive so to lose two, one of which was just reaching breeding age, is devastating.
One of the dead whales had been entangled in fishing gear, which poses a major threat to the ability of this species to recover. It is unclear what caused the death of the other whale.
Mexico has announced that it is to permanently ban the use of gillnets in the waters where the highly endangered vaquita is found, in an attempt to save the species from extinction.
The vaquita, which translates from spanish as "little cow", is a species of porpoise, whose numbers are thought to have dropped to around 60 surviving individuals.
It is only found in the northern part of the Gulf of California where gillnets are used to catch a species of fish, the totoaba, whose future is also under threat.
The Scientific Committee of the International Whaling Commission (IWC) has said that urgent action is needed to prevent one of the world's most endangered dolphins from becoming extinct.
A rescue team attempted to removed fishing gear from around a blue whale on Monday. According to local reports, the whale, thought to be around 80ft long, appeared to be tired when spotted by a local whale-watching company off Dana Point in California.