The advent of the molecular era has just generated a revolution in the development of new in vivo imaging techniques to examine the integrative functions of molecules, cells, organ systems and whole organisms. Molecular imaging constitutes a new tool allowing the biologist to characterize, repeatedly and non-invasively, a large number of experimental models developed in rodents. In order to monitor biological processes such as gene expression, normal development, metabolic alterations or medical treatment effects, several methodological and technological challenges have to be raised up. Developments are needed in chemistry to create new radiotracers or contrast agents, and in physic, to adapt the medical imaging techniques to the constraints of small animal investigations. ANIMAGE is a multimodal imaging platform to image the structure and function of systems using and developing different technologies such as autoradiography, ultrasounds, positron emission tomography (PET), X-ray computed tomography (CT), magnetic resonance imaging and spectroscopy (MRI/MRS). The first biological applications and results are presented.