Neutron stars are a very diverse population, both in their observational and
their physical properties. They prefer to radiate most of their energy at X-ray
and gamma-ray wavelengths. But whether their emission is powered by rotation,
accretion, heat, magnetic fields or nuclear reactions, they are all different
species of the same animal whose magnetic field evolution and interior
composition remain a mystery. This article will broadly review the properties
of inhabitants of the neutron star zoo, with emphasis on their high-energy
emission.Comment: 15 pages, 8 figure, to be published in Frontiers of Physic
