According to the National Wildlife Federation invasive out-compete native species NWF arrive as stowaways on ships, in wooden crates and palettes on ships, in wooden crates and palettes National Wildlife Federation National Wildlife Federation Invasive Species Article Dutch elm disease on ships, in wooden crates and palettes nwf.org on ships, in wooden crates and palettes National Wildlife Federation out-compete native species human-distributed on ships, in wooden crates and palettes invasive species invasive species invasive species National Wildlife Federation: Threats to Wildlife on ships, in wooden crates and palettes National Wildlife Federation National Wildlife Federation National Wildlife Federation National Wildlife Federation National Wildlife Federation "Invasive species" National Wildlife Federation on ships, in wooden crates and palettes invasive species invasive species NWF nwf.org invasive species species. invasive species on ships, in wooden crates and palettes "Invasive species" National Wildlife Federation organisms of all kinds have gone along for the ride National Wildlife Federation: Threats to Wildlife "Invasive species" invasive species Problem with Invasive Species on ships, in wooden crates and palettes National Wildlife Federation on ships, in wooden crates and palettes "Invasive species" Invasive species cause harm nwf.org on ships, in wooden crates and palettes invasive species invasive National Wildlife Federation human-distributed invasive species