Our retinas contain four different types of light-sensing photoreceptor cells: rods, which detect low levels of light, and three cone cell types which detect red, blue and green wavelengths of light. These allow us to see in (relative) black and white when it’s dark, and in vibrant colour when it’s lighter. The wavelengths that different animals…
Tag: evolution
#fossilfriday: Preserved brain visible in 520 million year-old arthropod
Almost all fossils represent the hard parts of long-gone animals: teeth, shells, bones and others. But palaeontologists do occasionally find fossilised soft tissue, too. This remarkable fossil was the first to be described where the brain and parts of the nervous system are visible – astonishingly – after more than 500 million years! Fuxianhuia protensa, an ancient…
In Focus: Innovations in bats’ skin helped flying mammals take off
This week’s post was written with the help of Dr Jorn Cheney, post-doctoral fellow at the Royal Veterinary College. If you would like to contribute a guest post, please get in touch on Twitter or Facebook. Powered flight has evolved four times in the animal kingdom: once each in insects, birds, pterosaurs and bats. Biomechanists have spent decades…
Happy #DarwinDay! Celebrating Charles’s 207th birthday with his favourite barnacles
These bright and beautiful barnacle illustrations are from a monograph of Darwin’s from 1851, Living Cirripedia. Barnacles, along with fancy pigeons, were an extremely important group to Darwin’s work, and he spent eight years studying them in minute detail and reclassifying the entire group. His studies, which interrupted to some extent his writing of On the Origin of…
Anatomy To You 