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Re: Pterosaurs and birds, was Re: birds and pterosaurs
Many birds tend to lose body weight in direct proportion to the percentage
of wing area lost during the moult so that the wingloading remains
relatively constant during the moult. This helps to maintain flight
capability, albeit at somewhat reduced efficiency.
I assume it is possible that feathers
of Argentavis grew faster, or Argentavis could somehow
find food with lowered ability to fly.
Still, moult and growth of feathers is a constraint
for modern birds. Feathers are keratin (protein) and
plumage is a significant part of body weight.