Stay close, please, children. We are here at the riverbank to look at the way different animal circulation systems move blood around their bodies. This furry creature is a water vole. Like all mammals ...

You probably don’t look like an insect. You don’t have feelers or wings. You keep your skeleton inside your body instead of on the outside. But what about blood? Do insects have blood like yours? I ...

How do insects control the effects of gravity when they climb a tree or hang upside-down waiting for prey? They don't have closed circulatory systems that restrict fluid flow to certain parts of the ...