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The trunk is so versatile that it is the only organ in any
animal that can flex, extend and bend without a bone
and/or a fulcrum.

Most terrestrial mammals respire by making negative
pressure in the chest by moving diaphragm towards
abdomen.  In elephants special respiratory muscles are
involved.

Elephants do not have pleural cavity around the lungs.
Haemoglobin of elephant is chemically related to
haemoglobin of whales.

Intra-abdominal testes, large body size, absence of pleural
cavity, haemoglobin similarity with marine mammals and
several others factors suggest an evolutionary
background of aquatic origin.  Trunk was more of a
snorkel!

Elephants ordinarily walk in a slow pace of 4 - 5 km in an
hour, but can run incredibly fast for short distances.

Elephant feeds on all three tiers of plant life, i.e., grass
(lower), browse (middle) and branches (upper canopy).  
They even feed on bark of trees.
Elephants sleep only for a few hours that too in the early
hours of the day.

Elephants cannot jump, but can hop, even when hobbled.

They communicate using infrasonic sounds through thick
jungle over several kilometres.  Infrasonic sounds are
produced by whales, and in nature, during thunder and
earthquake.  Infrasonic frequencies range from 5-24 Hz.  
Elephant calls are generally 2-10 seconds in duration with
fundamental frequencies ranging from 5 Hz (in the
infrasonic range) to 50 Hz (audible range).
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