The author mentions that all of the following are...

C

- Hướng dẫn giải

Đáp án C

Thông tin ở đoạn đầu tiên:
- It has also been noted by naturalists that a certain type of wasp always provides five – never four, never six - caterpillars for each of their eggs so that their young have something to eat when the eggs hatch
- Research has also shown that both mice and pigeons can be taught to distinguish between odd and even numbers of food pieces
- the naturalist Gilbert White tells how he surreptitiously removed one egg a day from a plover's nest , and how the mother laid another egg each day to make up for the missing one
Chỉ có caterpillars (sâu bướm) là không được nhắc đến