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//lame
if (type === 'aligator')
{
    aligatorBehavior();
}
else if (type === 'parrot')
{
    parrotBehavior();
}
else if (type === 'dolphin')
{
    dolphinBehavior();
}
else if (type === 'bulldog')
{
    bulldogBehavior();
}
else
{
    throw new Error('Invalid animal ' + type);
}

//better
var types = {
  aligator: aligatorBehavior,
  parrot: parrotBehavior,
  dolphin: dolphinBehavior,
  bulldog: bulldogBehavior
};

var func = types[type];
if (!func) throw new Error('Invalid animal ' + type); 
func();