> Swimming budgies?  Actually they can swim after a fashion -- mostly
> float with a lot of useless splashing.  They can't keep it up for long
> as they tend to tire themselves out, become water logged, and then good
> bye little bird.
I won't ask how you found that out. We may seem to be off topic here, but I
can imagine that there may well be new, undiscovered families of pelagic
mollusca which are parasitic on birds' feet. Why not? Cocculinids are found
on bone, feathers and chitinous squid beaks; seabirds spend long periods in
the water asleep, plenty long enough for larval molluscs to settle in the
hollows of their claws. These would then feed on proteinous residues from
fish blood. Microscopes out, lads!