Canadian crabs with bad attitude threaten coastal ecosystem
https://phys.org/news/2018-09-canadian-crabs-bad-attitude-threaten.html
The docile green crabs shrink from a threat, while the newcomers are more apt to wave their pincers and charge.
"What we're seeing is this insane level of aggressiveness," said Markus Frederich, a professor at the University of New England.
