How literal is this phrase?

Sample examples at http://tinyurl.com/is-it-lit

sitting duck:

Definitions:

  1. a defenseless victim

Examples:

  1. Tim to act as " decoy , " or as Tim puts it " a sitting duck . " The police guard is removed from Tim to lure the crooks who arrive
  2. : Ferdinand return gives lift to England James Lawton : Pot shots at Europe 's sitting ducks mean little as McClaren 's men wait for bigger game Business directory Christopher R Nethercoat
  3. have a formally constituted club . As things stand , we are slightly less a sitting duck for the tabloid rags , but the real reason by now is inertia . Maybe
  4. here the large mammals and birds , whether flightless or not , were the proverbial sitting ducks . enlarge friends flying mammals above town Bats are the only mammals to truly fly
  5. loss of personnel ( 55 % ) . However , what made UK firms " sitting ducks " according to the CMI , was the fact that most continuity plans failed to

Note: Please select the answers below carefully based on the definition which occurs frequently in the examples

Step 2: score of 0-5 for how literal is the use of "duck" in the phrase "sitting duck"
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