The two whales were spotted on Monday afternoon casually cruising along the coast together.

Experts say that even though they haven’t documented the sighting as official, it is normal for whales to be using the Strait of Gibraltar to cross between the Mediterranean and the Atlantic oceans.

It wasn’t confirmed which kind of whales they were but Fin whales are said to be the most usual whale to cross this part of the world.

The fin whale is the second largest animal to ever live, in the entire history of Earth. Reaching lengths of at least 85 feet (26 m) and weights of 80 tons, this species is second only to its close relative, the blue whale.

However, despite their size, they are not thought to be predatory and usually only eat smaller fishes such as plankton,  gulping up to 4,000 pounds (1.8 metric tons) of food a day.

They can also live up to 90 years of age and usually cross into the cooler Atlantic Ocean during the summer away from the busy Mediterranean Sea.

Despite being fast swimmers and their size, they have often been hunted by humans.

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