From the screenplay:
EXT. JUNGLE - DAY                     69M
   Still following the faint RINGING, Grant and Eric turn to find
   A SAIL
   moving through the low trees. We recognize it as the back of a
   spinosaurus. We might think it's any random spinosaurus,
   except for the RINGING coming from somewhere inside it.
   Grant and Eric press back against a tree, keep perfectly
   still as they hear the THOOOOMB, THOOOOMB, THOOOMB of the
   creature's footsteps reverberating. It's tail RUSTKES against
   the brush.
   It's moving behind them, and it's close.
   We hear the RINGING move from left to right as it passes. So
   far, its has no idea they're there.
   Looking across the clearing, Eric is startled to see
   PAUL AND AMANDA
   are no more than 20 yards away, also hiding. An involuntary
   reflex, Eric calls out...
            ERIC
      Mom! Dad!
   Grant immediately covers the boy’s mouth. But it's to late.
   The dinosaur has stopped. We still can't see it. We don't know how
   close it is.
   Paul and Amanda spot Eric with Grant. They're a thousand
   emotions at once: relieved, disbelieving, terrified, overjoyed.
   They want to run to him, to yell out to him, but the monster is
   close.
   Grant takes his hand off Eric's mouth. They both stay
   completely silent.
   All this time, the sat-phone is RINGING.
   Than it stops.
   And after an agonizing beat, the beast moves. At first we're
   not sure which direction it's headed, but finally we can tell
   its moving away.
   Once the sail is finally out of sight, Eric breaks from Grant's
   hold and dashes to his parents' arms. They coop him up. Hug
   him, 
kiss him, their affection unquenchable. He's crying.