Sensory system  
Mouth  
Upper lip with large cleft ¹  
Incisors  
External nares (1 pair) ¹  
Whiskers ¹  
Eye with eyelid  
Pinna  
    _{All above traits are better
    visible in the next step}

  Locomotor system  
Front leg  
Hind leg  
Tail  

  Excretory &
  reproductive system  
Teats (6 pairs)  
Urogenital opening  
Anus  

None 

    _{1: unclear/indistinguishable
    2: not visible}  

  Digestive system  
Oesophagus ²  
Stomach ¹  
Liver (4 lobes)  
Duodenum ¹  
Pancreas  
Jejunum  
Ileum  
Caecum  
Colon  
Rectum ¹  
Anus  

  Cardiovascular system  
Heart  

  Respiratory system  
Lung  
Diaphragm ¹  

  Lymphatic system  
Thymus  
Spleen ¹  

  Excretory system  
Kidney ²  
Urinary bladder  

  Reproductive system  
Mammary glands ¹  
Ovary and oviduct ²  
Uterus body ¹  
Uterine horn (1 pair)  
Vagina  

None 

    _{1: unclear/indistinguishable
    2: not visible}  

  Digestive system  
Oesophagus  
Stomach  
Liver (4 lobes)  
Duodenum  
Pancreas  
Jejunum  
Ileum  
Caecum  
Colon  
Rectum ¹  
Anus  

  Cardiovascular system  
Heart  

  Respiratory system  
Lung  
Diaphragm ²  

  Lymphatic system  
Thymus  
Spleen  

  Excretory system  
Kidney  
Urinary bladder  

  Reproductive system  
Mammary glands ¹  
Ovary and oviduct ¹  
Uterus body  
Uterine horn (1 pair)  
Vagina  

None 

    _{1: unclear/indistinguishable
    2: not visible}