Thus when the halyard was hoisted to some thirty or
forty feet above the deck, the line would be covering a considerable
distance of sea.
The birds flying round the ship congregate for the main part in the wake,
for here they find the scraps thrown overboard on which they feed. I have
seen six albatross all together trying to eat up an empty treacle tin.
As they fly to and fro their wings are liable to touch the line which is
spread out over the sea. Sometimes they will hit the line with the tips
of their wings, and then there is no resulting capture, but sooner or
later a bird will touch the line with the part of the wing above the
elbow-joint (humerus). It seems that on feeling the contact the bird
suddenly wheels in the air, thereby causing a loop in the line which
tightens round the bone. At any rate the next thing that happens is that
the bird is struggling on the line and may be hauled on board.
The difficulty is to get a line which is light enough to fly in the air,
but yet strong enough to hold the large birds, such as albatross, without
breaking. We tried fishing line with no success, but eventually managed
to buy some 5-ply extra strong cobbler's thread, which is excellent for
the purpose. But we wanted not only specimens, but also observations of
the species, the numbers which appeared, and their habits, for little is
known as yet of these sea birds.
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