Filephoto: Blue Whale (Balaenoptera musculus)

New Population of Pygmy Blue Whales Discovered

Pygmy blue whales are the smallest members of the blue whale family, but that's the only small thing about them: they can reach up to 24 meters long.

Despite their enormous size, blue whales have been difficult to observe in the Southern Hemisphere as they live offshore and don't jump around like the humpback whales; thus, for some regions, their population structure, distribution and migration routes remain poorly understood. In particular, little is known about the blue whales in the northern Indian Ocean.

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Chromis viridis (green chromis) is a species of damselfish.

Fish trust friends in a crisis

In social animals living in the wild, individuals rely on their buddies to alert them if a predator is lurking.



All animals aim to balance the risk of predation against the energy investment necessary to execute an escape, to maximise the number of correct reactions (e.g. reacting to the presence of a predator) and minimise reactions to inaccurate information (e.g. reacting to harmless stimuli).

Trust among individuals is critical. This is true for humans as well as many other species, including fishes.

Study co-author Jacob Johansen, Ph.D.

A diver examines the remains of an ancient military vessel discovered in the Mediterranean sunken city of Thonis-Heracleion off the coast of Alexandria, Egypt, in this handout image released on July 19, 2021.
A diver examines the remains of an ancient military vessel discovered in the Mediterranean sunken city of Thonis-Heracleion off the coast of Alexandria, Egypt, in this handout image released on July 19, 2021.

Egypt finds ancient military vessel

Prior to the founding of Alexandria by Alexander the Great in the year 331 BC, Thônis-Heracleion was the largest port city in Egypt, controlling the entrance to the country at the mouth of a western branch of the Nile River and dominating the area for centuries.

Destroyed and sunk along with a wide area of the Nile delta by several earthquakes and tidal waves, Thônis-Heracleion was rediscovered in 2001 in Abu Qir Bay near Alexandria, now Egypt's second-largest city.

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