Nitrogenous waste is excreted in the form of pellet or paste by:

Uricotelic animals excrete nitrogenous waste as uric acid in the form of a paste or pellet to conserve water. This is characteristic of Reptiles, Birds, Land Snails, and Insects. Pavo (Peacock) is a bird and thus uricotelic.Ornithorhynchus is a mammal (ureotelic).Salamandra is an amphibian and Hippocampus is a fish (typically ammonotelic or ureotelic).