Rats can learn (1) to perform/performing tricks, cats seem (2) sense/to sense what we are feeling.

Ольга в категроии Английский язык, вопрос открыт 21.10.2018 в 17:48

Dogs know when their owners are coming home and anyone who has swum with (3) a/ the dolphin will tell you that these animals are (4) more/most intelligent (5) of/than most people think. Clearly, animals can (6) to learn/learn and (7) remember/to remember. However, they lack language and (8) a/the ability to understand what they are and they therefore can`t really (9) be/being considered intelligent creatures. Studies carried out on chimpanzees and gorillas suggested that they are able (10) to learn/learn symbols and sounds. But are they actually using them (11) communicate/to communicate? No one knows. In (12) the/a late 1960s, (13) an/the American scientist tried (14) to find/finding out if various animals understood what they actually were. He painted (15) a/the red dot on their faces and put them in front of a mirror. If an animal touched (16) a/the red spot, it was, according to (17) a/the scientist, actually recognizing itself in (18) a/the mirror. Besides humans, only chimpanzees and orangutans passed this test.