PILNE 2 Fill in: intelligent, quiet, inexpensive, endangered, warm-blooded. 1 Tigers are an) species - there are only about 3,200 of them left. 2 Ryan's dog is so -; it never makes a noise. 3 Cats are pets and they can understand many things. 4 Polar bears are animals and their body temperature doesn't change, even when it's very cold outside 5 Lucy doesn't have a lot of money, so she bought a hamster because they are to keep Marks: