Zebra and quagga mussels entered the Great Lakes in large ships’ ballast water. Now, local boaters and anglers are spreading them into the southern and western US.
Caddisfly larvae rearrange pebbles on the river bed to build themselves a shelter.
FJAH / shutterstock
The UK’s environment agency has confirmed quagga mussels, a fresh or brackish water mollusc, have been found in a reservoir near London. Quagga were previously identified as one of the single greatest…