Italian crested newt
When newts are inactive or in oxygen-rich environments, respiration can be done through their skin which accounts for 74% of the cutaneous respiration. However, oxygen-poor environments, such as stagnant ponds, pose a threat to the survival of larval newts. This is because oxygen molecules do not readily dissolve in water, and as "T. carnifex" is an immobile animal, extracting oxygen from water is difficult. Newts consequently have external gills at birth that persist until metamorphosis, which assists survival in low-oxygen conditions.
Portia fimbriata
A test in 2001 showed that four jumping species take nectar, either by sucking free nectar from the surface of flowers or biting the flowers with their fangs. The spiders fed in cycles of two to four minutes, then groomed their bodies and especially their chelicerae, before another cycle. A more formal part of the test showed that 90 juvenile jumping spiders, including "P. fimbriata", generally prefer to suck from blotting soaked with a 30% solution of sugar rather than paper soaked with distilled water. The authors suggest that, in the wild, nectar may be a frequent, convenient way to get some nutrients, as it would avoid the work, risks and costs (such as making venom) of predation. Jumping spiders may benefit from amino acids, lipids, vitamins and minerals normally found in nectar.