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 ...

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 ...

Quirks and Quarks19:53Our planet’s circulatory system depends on animals eating, excreting and expiring From the tiniest insects to the largest whales, biologist Joe Roman says animals play an ...