...to study which neuronal cell types and pathways in the retina are involved in the processing of magnetic signals. The processing of magnetic compass information in migratory birds is initiated in the retina, presumably in cryptochrome 4-expressing double cone photoreceptors. Magnetic information is likely sent from retinal ganglion to higher brain areas cells via the thalamofugal pathway. However, the retinal circuitry that processes magnetic information is not known so far. To investigate this, we will combine electrophysiological recordings with a detailed morphological analysis of the processing pathways in the bird retina.