Here are the entire verses about the Behemoth from the KJV:

15 Behold now behemoth, which I made with thee;
         he eateth grass as an ox.

16 Lo now, his strength is in his loins,
         and his force is in the navel of his belly.

17 He moveth his tail like a cedar:
         the sinews of his stones are wrapped together.

18 His bones are as strong pieces of brass;
         his bones are like bars of iron.

19 He is the chief of the ways of God:
       he that made him can make his sword to approach unto him.

20 Surely the mountains bring him forth food,
         where all the beasts of the field play.

21 He lieth under the shady trees,
         in the covert of the reed, and fens.

22 The shady trees cover him with their shadow;
         the willows of the brook compass him about.

23 Behold, he drinketh up a river, and hasteth not:
         he trusteth that he can draw up Jordan into his mouth.

24 He taketh it with his eyes:
         his nose pierceth through snares.

16 might be better rendered "Lo now, his strength is in his loins,
and his virility in the muscles of his belly."

17 "His tail stiffens as a cedar:
the sinews of his thighs [or testicles] are tangled [or wrapped] together."

20 "The beasts of the mountains raise their voices unto him,
and all the beasts of the field play there." All creatures worship him, due to his might.

21 "He is shaded by the lotus,
the reeds surround him." This is a Nilotic refference.

22 "Behold, he reiveth up a river [or the level sinks] and panics not:
he worries not when Jordan flows into his mouth." It is not absolutely clear the exact meaning of the first part, but it's clear that he is not frightened by the movement of water.

23 "He [the hunter] taketh it with his eyes:
his [the Behemoth] nose is pierced by snares." Hunting refference, it is either strait, or rhetorical.