The Irish Whale and Dolphin Group (IWDG) are reporting that another whale has been washed ashore in Falcarragh.
Two whales were washed ashore in Donegal and Mayo within a period of 72 hours recently. One whale was on Sheephaven Bay and another one on Gola Island.
A third was found at Tirraun on the Mullet Peninsula in County Mayo.
The IWDG originally received reports of three dead whales on August 4 in counties Donegal and Mayo.
It is understood that the whale that has washed ashore in Falcarragh may also be a Cuvier Beaked Whale.
The Irish Whale and Dolphin Group (IWDG) say the recorded strandings of Cuvier's beaked whales is "definitely cause for concern."
The IWDG says it has also received two further reported Cuvier's strandings from Omey Island, Co Galway on August 3 and from Cliffony, County Sligo on August 7.
Speaking on RTÉ, Dr Simon Berrow, of the IWDG said: "Cuvier's beaked whales are a deep diving species and have previously been found to be particularly affected by loud underwater man-made noise, for example naval sonar.
He said that other dead carcasses may not wash ashore or may go unreported for other reasons.