And the keel-like protrusion on their sternums, where the flight muscles attach, shrinks or disappears, except in penguins, who repurpose their flight muscles and keels for swimming.
A forma em quilha do esterno onde estão as ligações dos músculos do voo, encolhe ou desaparece, exceto nos pinguins, que adaptam os músculos de voo e as quilhas para nadar.