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solution to the problem of pumping blood in a long neck。〃
    〃Yes?〃
    〃You're looking at it right now;〃 Levine said。
    Arby clapped his hands。 〃They don't raise their necks!〃
    〃Correct;〃 Levine said。 〃At least; not very often; or for long periods。 Of course; right now the animals are drinking; so their necks are down; but my guess is that if we watch them for an extended period we'll find they don't spend much time with their necks raised high。〃
    〃And that's why they don't eat the leaves on the trees!〃
    〃Right。〃
    Kelly frowned。 〃But if their long necks aren't used for eating; then why did they evolve them in the first place?〃
    Levine smiled。 〃There must be a good reason;〃 he said。 〃I believe it has to do with defense。〃
    〃Defense? Long necks?〃 Arby stared。 〃I don't get it。〃
    〃Keep looking;〃 Levine said。 〃It's really rather obvious。〃
    Arbv peered through binoculars。 He said to Kelly; 〃I hate it when he tells us it's obvious。〃
    〃I know;〃 she said; with a sigh。
    Arby glanced over at Thorne; and caught his eye。 Thorne made a V with his fingers; and then pushed one finger; tilting it over。 The movement forced the second finger to shift; too。 So the two fingers were connected。。。。
    If it was a clue; he didn't get it。 He didn't get it。 He frowned。
    Thorne mouthed: 〃Bridge。〃
    Arby looked; and watched the whip…like tails swing back and forth over the younger animals。 〃I get it!〃 Arby said。 〃They use their tails for defense。 And they need long necks to counterbalance the long tails。 It's like a suspension bridge!〃
    Levine squinted at Arby。 〃You did that very fast;〃 he said。
    Thorne turned away; hiding a smile。
    〃But I'm right。。。〃 Arby said。
    〃Yes;〃 Levine said; 〃your view is essentially correct。 Long necks exist because the long tails exist。 It's a different Situation in theropods; which stand on two legs。 But in quadrupeds; there needs to be a counterbalance for the long tail; or the animal would simply tip over。〃
    Malcolm said; 〃Actually; there is something much more puzzling about this apatosaur herd。〃
    Oh?〃 Levine said。 〃What's that?〃
    〃There are no true adults;〃 Malcolm said。 〃Those animals we see are very large by our standards。 But in fact; none of them has attained full adult size。 I find that perplexing。〃
    〃Do you? It doesn't trouble me in the least;〃 Levine said。 〃Unquestionably; it is simply because they haven't had enough time to reach maturity。 I'm sure apatosaurs grow more slowly than the other dinosaurs。 After all; large mammals like elephants grow more slowly than small ones。
    Malcolm shook his head。 〃That's not the explanation;〃 he said。
    〃Oh? Then what?〃
    〃Keep looking;〃 Malcolm said; pointing out over the plain。 〃It's really rather obvious。〃
    The kids giggled。
    Levine gave a little shiver of displeasure。 〃What is obvious to me;〃 he said; 〃is that none of the species appear to have attained full adulthood。 The triceratops; the apatosaurs; even the parasaurs are a bit smaller than one would expect。 This argues for a consistent factor: some element of diet; the effects of confinement on a small island; perhaps even the way they were engineered。 But I don't consider it particularly remarkable or worrisome。〃
    〃Maybe you're right;〃 Malcolm said。 〃And then again; maybe you're not。〃

Puerto Cortés
    
〃No flights?〃 Sarah Harding said。 〃What do you mean; there are no flights?〃 It was eleven o'clock in the morning。 Harding had been flying for the last fifteen hours; much of it spent on a U。S。 military transport that she'd caught from Nairobi to Dallas。 She was exhausted。 Her skin felt grimy; she needed a shower and a change of clothes。 Instead she found herself arguing with this very stubborn official in a ratty little town on the west coast of Costa Rica。 Outside; the fain had stopped; but the sky was still gray; with low…hanging clouds over the deserted airfield。
    〃I am sorry;〃 Rodríguez said。 〃No flights can be arranged。〃
    〃But what about the helicopter that took the men earlier?〃
    〃There is a helicopter; yes。〃
    〃Where is it?〃
    〃The helicopter is not here。〃
    〃I can see that。 But where is it?〃
    Rodríguez spread his hands。 〃It has gone to San Cristóbal。〃
    〃When will it be back?〃
    〃I do not know。 I think tomorrow; or perhaps the day after。〃
    〃Se?or Rodríguez;〃 she said firmly; 〃I must get to that island today。〃
    〃I understand your wish;〃 Rodríguez said。 〃But I cannot do anything to help this。〃
    〃What do you suggest?〃
    Rodríguez shrugged。 〃I could not make a suggestion。〃
    〃Is there a boat that will take me?〃
    〃I do not know of a boat。〃
    〃This is a harbor;〃 Harding said。 She pointed out the window。 〃I see all sorts of boats out there。〃
    〃I know。 But I do not believe one will go to the islands。 The weather is not so favorable。〃
    〃But if I were to go down to … 〃
    〃Yes; of course。〃 Rodríguez sighed。 〃Of course you may ask。〃
    Which was how she found herself; shortly after eleven o'clock on a rainy morning; walking down the rickety wooden dock; with her backpack on her shoulder。 Four boats were tied up to the dock; which smelled strongly of fish。 But all the boats seemed to be deserted。 All the activity was at the far end of the dock; where a much larger boat was tied up。 Beside the boat; a red Jeep Wrangler was being strapped for loading; along with several large steel drums and wooden crates of supplies。 She admired the car in passing; it had been specially modified; enlarged to the size of the Land Rover Defender; the most desirable of all field vehicles。 Changing this Jeep must have been an expensive alteration; she thought: only for researchers with lots of money。
    Standing on the dock; a pair of Americans in wide…brimmed sun hats were shouting and pointing as the Jeep lifted lopsidedly into the air; and was swung onto the deck of the boat with an ancient crane。 She heard one of the men shout 〃Careful! Careful!〃 as the Jeep thudded down hard on the wooden deck。 〃Damn it; be careful!〃 Several workmen began to carry the boxes onto the ship。 The crane swung back to pick up the steel drums。
    Harding went over to the nearest man and said politely; 〃Excuse me; but I wonder if you could help me。〃
    The man glanced at her。 He was medium height; with reddish skin and bland features; he looked awkward in new khaki safari clothes。 His manner was preoccupied and tense。 〃I'm busy now;〃 he said; and turned away。 〃Manuel! Watch it; that's sensitive equipment!〃
    〃I'm sorry to bother you;〃 she continued; 〃but my name is Sarah Harding; and I'm trying … 〃
    〃I don't care if you're Sarah Bernhardt; the … Manuel! Damn it!〃 The man waved his arms。 〃You there! Yes; you! Hold that box upright!〃
    〃I'm trying to get to Isla Sorna;〃 she said; finishing。
    At this; the man's entire demeanor changed。 He turned back to her slowly。 〃Isla Sorna?〃 he said。 〃You're not associated with Dr。 Levine by any chance; are you?〃
    〃Yes; I am。〃
    〃Well; I'll be damned;〃 be said; suddenly breaking into a warm smile。 〃What do you know!〃 He extended his hand。 〃I'm Lew Dodgson; from the Biosyn Corporation; back in Cupertino。 This is my associate; Howard King。〃
    〃Hi;〃 the other man said; nodding。 Howard King was younger and taller than Dodgson; and he was handsome in a clean…cut California way。 Sarah recognized his type: a classic beta male animal; subservient to the core。 And there was something odd about his behavior toward her: he moved a little away; and seemed as unfortable around her as Dodgson now seemed friendly。
    〃And up there;〃 Dodgson continued; pointing onto the deck; 〃is our third; George Baselton。〃
    Harding saw a heavyset man on the deck; bent over the boxes as they came on board。 His shirtsleeves were soaked in sweat。 She said; 〃Are you all friends of Richard?〃
    〃We're on our way over to see him right now;〃 Dodgson said; 〃to help him out。〃 He hesitated; frowning at her。 〃But; uh; he didn't tell us about you。。。。〃
    She was suddenly aware then of how she must appear to him: a short woman in her thirties; wearing a rumpled shirt; khaki shorts; and heavy boots。 Her clothes dirty; her hair unkempt after all the flights。
    She said; 〃I know Richard through Ian Malcolm。 Ian and I are old friends。〃
    I see。。。〃 He continued to stare at her; as if he was unsure of her in some way。
    She felt pelled to explain。 〃I've been in Africa。 I decided to e here at the last minute;〃 she said。 〃Doc THorne called me。〃
    〃Oh; of course。 Doc。〃 The man nodded; and seemed to relax; as if everything now made sense to him。
    She said; 〃Is Richard all right?〃
    〃Well; I certainly hope so。 Because we're taking all this equipment to him。〃
    〃You're going to Sorna now?〃
    〃We are; if this weather holds;〃 Dodgson said; glancing at the sky。 〃We should be ready to go in five or ten minutes。 You know; you're wele to join us; if you need a ride;〃 he said cheerfully。 〃We could use the pany。 Where's your stuff?〃
    〃I've only got this;〃 she said; lifting her small backpack。
    〃Traveling light; eh? Well; good; Ms。 Harding。 Wele to the party。〃
    He seemed entirely open and friendly now。 It was such a marked change from his earlier b

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