Trout face upstream, so they can only see you if you’re upstream of them – right? Logical assumption, but not right. That might be the case if it were a human facing upstream, but trout have eyes that ...

Zebrafish are known to detect color and brightness with the pineal gland, which is part of the brain. How they do so is now being elucidated. We see color because photoreceptor cones in our eyes ...