They prey on small invertebrates, amphibians, reptiles, small mammals and birds. Reptiles are generally considered less intelligent than mammals and birds. Animals parasitised include molluscs, woodlice, millipedes, insects, mammals, and amphibians. Redwood forests provide habitat for a variety of amphibians, birds, mammals, and reptiles. Marsupial reproductive organs differ from the placental mammals. Coronaviruses cause diseases in mammals and birds. It mainly eats insects, small mammals, and birds. The interclavicle is absent in marsupials and placental mammals. Picornaviruses are found in mammals and birds. Friendship is found among animals of higher intelligence, such as higher mammals and some birds. Primarily feeds on small mammals and birds. Wombats release less than other herbivorous mammals. Coronaviruses are a group of related RNA viruses that cause diseases in mammals and birds. It infects the livers of various mammals, including humans. Their role in causing diseases in humans and mammals is understudied.