Fit for Life

further study showed that each little bacterium had a chain of dense particles inside，which proved magnetic.the bacteria had made themselves into little magnets that could line up with the earth’s magnet.
the big news was that a living thing，even a simple bacterium，can make magnetite.that led to a search to see whether animals might have it.. by using a special instrument called magnetometer，scientists were able to find magnetite in bees and birds，and even in fish.in each animal，except for the bee.the magnetic stuff was always in or closer to the brain.
thus.the idea of a built—in animal compass began to seem reasonable.
the magnetic sense — the living compass
passage outline supporting details
the existence of the earth magnet and the invention of the navigating compass ◇our earth is a big magnet and a little freely (56)   ▲  magnetic needle lines itself with the earth magnet to point north and south.
◇(57)   ▲   on the idea above, the navigating compass was invented.
the possibility of birds’ built-in compasses ◇ one piece of evidence is the (58)   ▲    of many birds between their summer homes and winter homes.
◇ birds can recognize star patterns on clear nights and keep on course (59)   ▲     under cloudy skies 
the  (60)   ▲     on pigeons’ and bees’ built-in compasses
 ◇little magnets were tied to the pigeons’ heads to (61)   ▲     their magnetic sense.
◇the pigeons’ magnetic sense seemed to be affected on (62)   ▲    days.
◇similar things with the same results were done with bees.
the  (63)   ▲     of the magnetic stuff for the animal compass ◇little rod-like bacteria were found by chance to swim together in the direction of (64)   ▲    .
◇some animals had a chain of dense magnetic particles in or close to the (65)   ▲     inside their bodies.
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