Chris agrees to help an orphaned lamb which lacks natural immunity normally passed on by the lactating mother, recruiting a country 'donor' ewe, a veterinary first. On his way back, he's called urgently to the reptilian zoo, which received a wandering young platypus, exhausted and covered in eighty ticks, luckily non-toxic parasites. The hospital must diagnose a tomcat with incurable, highly contagious feline leukemia, and has to test its playmate, daunting as the owner's third cat died undiagnosed fairly recently. By: KGF Vissers