Invasive Species Matching Activity at Apostle Islands National Lakeshore, illustrating various invasive species and their descriptions to educate about ecological threats.

- Round Goby: This fish has a rounded-head and reproduces rapidly, out completing many native fish for food.
- Rusty Crayfish: An aggressive rust-colored crayfish from the Ohio River.
- Eurasian Ruffe: An aggressive fish from Europe and Asia that reproduces rapidly and has a sharp dorsal fin.
- Zebra Mussel: A tiny member of the mollusk family from Russia that spreads rapidly and filters nutrients and oxygen from the water.
- Purple Loosestrife: A beautiful purple flowering plant that can be 6’ feet tall and makes up to 3 million seeds/year.
- Spiny-Tailed Waterflea: Near microscopic zooplankton 3/8” long from Europe, whose spiny tail causes problems.
- Sea Lamprey: A jawless fish from the ocean that almost wiped out some native fish populations in the Great Lakes.
- Eurasian Milfoil: An aquatic plant from Europe and Asia the clogs waterways and displaces native vegetation.