Polysplenia is the presence of multiple accessory spleens rather than one normal spleen. Beaked whales have several anatomical adaptations to deep diving&colon; large spleens, livers, and body shape. This can include animal feet, livers, lungs, heads, spleens, etc. Although they have many spleens, each is usually ineffective resulting in functional asplenia. Although present, the multiple small spleens are often ineffective; this is termed functional asplenia. These documents list the main symptoms as fever and enlarged spleens. In some cases, one or more accessory spleens are discovered and also removed during surgery. Most of the spleens removed from Greater Swiss Mountain Dogs are by and very thick. Immunocompetent individuals with healthy spleens often recover without treatment. These accessory spleens are non-functional.