Male Reproductive system
(i) Male reproductive system of rabbit consists of a pair of testes which are ovoid in shape.
(ii) Testes are enclosed by scrotal sacs in the abdominal cavity
(iii) Each testis consists of numerous fine tubules called seminiferous tubules
(iv) This network of tubules lead into a coiled tubule called epididymis, which lead into the sperm duct called vas deferens.
(v) Below the urinary bladder is the urethra. Vas deferens joins the urethra.
(vi) Urethra runs backward and passes into the penis.
(vii) There are three accessory glands namely prostate gland, cowper's gland and perineal gland. Their secretions are involved in reproduction.

Locomotion in leech takes place by
(i) Looping or crawling movement
(ii) Swimming movement.
(i) Looping or Crawling movement:
i). This type of movement is brought about by the contraction and relaxation of muscles.
ii).The two suckers serve for attachment during movement on a substratum.
(ii) Swimming movement:
i). Leeches swim very actively and perform undulating movements in water.

(i) Circulation is brought about by haemocoelic system.
(ii) There are no true blood vessels.
(iii) The blood vessels are replaced by channels called haemocoelic channels or canals filled with blood-like fluid. The coelomic fluid contains hemoglobin
(iv) There are four longitudinal channels. One lies above the alimentary canal (dorsal), one below the alimentary canal (ventral) and two on either side of the alimentary canal (lateral), which serve as the heart and have inner valves.

(i) Canines are absent.
(ii) Hence, a gap is seen between the incisors and premolars.
(iii) This is called diastema.
(iv) It helps in mastication and chewing of food in herbivorous animals.

The leech, while making incision on the skin it also injects an anaesthetic substance that prevents the host from feeling the bite.