the.com/gill
a feather worn on the inside, breathing water nobody else can taste
oxygen extractionpulls up to 80% of dissolved oxygen passing through
countercurrent flowblood and water move opposite ways for max uptake
axolotl flairsome salamanders wear feathery gills externally, forever
old measurea gill is also a quarter-pint of liquor
surface areafolded filaments cram huge area into tiny space