Animals, like plants, are one of the major elements of urban ecosystem. Contamination of environment, building’s modernization and reducing of city greenery make however significant decline in number of animal species in built-up areas. Activists and designers are trying to change that by creating for them appropriate environment or special shelters so once again people and animals can co-exist together. Future of Architecture must contain a vison to share built-up word not only with plants but also animals.