The shortest cow is Diana, a 7 year old Vechur cow, born and bred at the Vechur Conservation Centre, Kerala, India, who measured 77 cm (30 in) from the hoof to the withers on 9 November 2010.
The smallest Rubik’s Cube is10 mm (0.39 in) wide and was created by Evgeniy Grigoriev (Russia). It is fully functional and can be used like a normal Rubik’s Cube.
The smallest jet engine measures just 600nm across and weighs 1 femtogram (10^-15 kg). It was produced by Leibniz Institute Solid State Physics Dresden and demonstrated in Dresden, Germany, in September 2010.
The smallest rescue dog is Momo (Peach), a 7 year old chihuahua who weighs just 3kg (6.6lb). She has been incorporated into the Japanese police force to help with search and rescue, given her small size and ability to get into smaller places, that other larger breeds cannot access.