This is a simple, yet effective, game to help your students get used to the difference between animals and insects.
Split your class in to two teams and give each some paper money (somewhere between 5 and 10 dollars/pounds should do it). Tell them that they are going to bet on whether they think the part of the picture they see is an animal or insect. Place a maximum bet restriction on them and say that if they are correct they get double their money back. If they are wrong, however, you keep the money. The winner is the team (or teacher) with the most money.
The picture they are looking at is in the "OR" of the title and is very small but it should keep them guessing. SImply click on the picture to reveal the answer when you are ready.
It is quite a noisy game but it works really well with most age groups.