Adaptations of terrestrial animals

Adaptations of terrestrial animals . Earthworms and land Planarians secrete a mucus coating to maintain a moist situation for burrowing, coiling, respiration, etc., . Arthropods have an external covering over the respiratory surfaces and well- developed tracheal systems. . In vertebrate skin, there are many cellular layers besides the well protected respiratory surfaces that help in preventing loss of water. . Some animals obtain their water requirement from food as partial replacement of water lost through excretion. . Birds make nests and breed before the rainy season as there is availability of abundant food. But during drought birds rarely reproduce. . Camels are able to regulate water effectively for evaporative cooling through the skin and respiratory system and excrete highly concentrated urine, and can also withstand dehydration up to % of their body weight.