Content with tag visual signalling .

Nocturnal birds could communicate through the fluorescence of their feathers

Many nocturnal animals, including invertebrates such as scorpions and a variety of vertebrate species, including toadlets, flying squirrels, owls, and nightjars, emit bright fluorescence under ultraviolet light. However, the ecological significance of this unique coloration so attached to nocturnality remains obscure. An intensively studied population of migratory red-necked nightjars (Caprimulgus ruficollis) was used to investigate inter-individual variation in porphyrin-based pink...

Living in the dark does not mean a blind life: bird and mammal visual communication in dim light

For many years, it was believed that bird and mammal communication ‘in the dark of the night’ relied exclusively on vocal and chemical signalling. However, in recent decades, several case studies have conveyed the idea that the nocturnal world is rich in visual information.