Sevenoaks Catalyst Magazine - Planet Earth Issue 2 - Summer term 2020 | Page 28

ANIMAL MAGNETISM Some organisms, actually quite a lot, have a sixth sense with which they navigate the Earth. This includes birds, lobsters, fish and even bacteria. The simplest way in which organisms use magnetic fields to orient themselves is used by magnetotactic bacteria. They’re aquatic and contain magnetosomes, magnetic iron nanocrystals in large chains which account for a pretty substantial amount of body mass. These crystals are about 35-120 nm in diameter, which allows for maximum magnetic moment per unit volume. The bacterium can use these forces to align with the Earth’s magnetic field without any expenditure of its own energy. Photo Taken by F. C. Franklin LEAH DE WET