The best video in my opinion about the decisive battle in Reconquista VS the Islam. Las Navas de Tolosa.
(In castilian, but quite descriptive of the moments of the battle).
EUROPEAN FORCES (70.000 to 100.000):
Castilians, the soul of the army, 50.000.Portuguese, Navarres and Aragonese, 20.000French, (with massive retreats, although)30.000.
And the legendary Órdenes Militares (military Orders):
Updated 11-18-2010 at 01:06 PM by Don
Parasitism is a type of symbiotic relationship between organisms of different species where one organism, the parasite, benefits at the expense of the host.
The harm and benefit in parasitic interactions concern the biological fitness of the organisms involved. Parasites reduce host fitness in many ways, ranging from general or specialized pathology to the modification of host behaviour.
Parasites increase their fitness by exploiting hosts for food, habitat and dispersal.