Scots pine Pinus sylvestris and Larch Larix species (particularly plantations of L. decidua)
The birds had a slight crossbill just like the other Loxops species.
The Parrot Crossbill is a specialist feeder on the cones of Scots pine.
The Scottish Crossbill breeds in the native Scots pine (Pinus sylvestris), Caledonian forests of the Scottish Highlands, but (perhaps surprisingly), often also in forestry plantations of exotic conifers, notably Larch (Larix decidua and L. kaempferi) and Lodgepole pine (Pinus contorta).
Another crossbill on Hispaniola was previously treated as a subspecies, Loxia leucoptera megaplaga, but is now treated as a distinct species, Hispaniolan Crossbill, Loxia megaplaga.