Guinea pigs There scientific name is Cavia porcelles. They can weigh 0.7- 1.2 kg. (Adult) There length can be 20-25 cm. (Adult) There lifespan can be four to five years. A baby guinea pig is called a pup. There are alot of diffrent breeds like Coronet,American satin,Teddy,Texel,White Crested and so much more. Do you like guinea pigs tell me your answer.