How do I fit in?

Amphibian eggs are surrounded by a gelatinous mass and an outer membrane and rely upon diffusion for nutrient and waste exchange very much like the egg of a fish, and must have direct access to water or have a coating of mucus to inhibit evaporation. What investigation of the visual capabilities that has been performed suggests that the echidna has visual abilities resembling those of a rat. Because of these poor visual abilities, the echidna relies heavily upon other senses and can detect minute electrical currents with its snout.