Metamorphosis in #newts proves costly https://phys.org/news/2026-05-metamorphosis-newts-sex-paying-heavier.html "In the palmate newt, metamorphosis is optional: depending on conditions, an individual may remain in a paedomorphic state or undergo metamorphosis... The transformation involves both a costly bodily reorganization and a reduction in energy intake... Females begin to lose weight earlier, lose more weight, complete metamorphosis later... males are more frequently observed undergoing metamorphosis... it costs them proportionally less."