It is this that gives them an appealing look to human beings. It contains only rod cells which are able to respond to changes at low light intensity. As the animal swims deeper, the less light there is. Also, there is often much turbulence. There are no cone cells in the retina which are responsible for detail and also for colour vision, so seals do not have colour vision.
Seals can see clearly in both air and water by changing the shape of eye.
I was wondering if you have done anything to help make people notice the extinction of amphibians at the zoo. This is a very important subject to me. The Mallorcan midwife toad has been bred so successfully that hundreds have been returned to their natural habitat - the plunge pools high in the mountains, north of Mallorca. We produced a poster of the toad with text in Catalan for distribution in Mallorca informing local people about their toad. The agile frog is found in Jersey where its existence is threatened and we have participated in a conservation program in conjunction with local groups.