seeds use barbed spines to hitch a ride from the mainland. When the
bird preens its feathers, the seeds fall off. The seeds of fruits like
strawberries may make the trip in the stomachs of birds.
Horse-bot Flies came
to Sable with the horses. Their larvae are parasites living in the
intestines of horses. When the horses — their hosts — arrived on
Sable, so did the fly larvae. Because horses are no longer taken
to the island, these flies may now be cut off from mainland populations.
People have brought many
species to Sable, both deliberately and accidentally. Some
thrived, but others perished. Be sure
to see "What
happened to the animals?" to learn their story.