Around the globe, penguins populations are diving, with certain groups expected to shrink to 20 percent of their current size by the year 2100.
An international team of biologists scoured reports and research going back nearly 250 years, covering all 18 species of penguin (most of which are endangered or threatened), from the little blue penguin to the four-foot-tall emperors. They identified nine ways humans pose problems to penguins in the journal Conservation Biology:
- Penguins killed for their oil, skin and feathers
- Penguins killed as crab or rock lobster bait
- Egg harvesting
- Habitat loss
- Marine pollution
- Bycatch and competition from the fishing industry
- Climate change
- Environmental variability
- Disease and poisoning from toxic algae
"Habitat loss, pollution, and fishing, all factors humans can readily mitigate," the authors say, "remain the primary threats for penguin species."
But don't abandon all hope for these black-and-white birds just yet. The silver lining is that penguins are tough critters: "Many populations of penguins appear to be resilient, and given adequate protection, including sufficient habitat and food, populations can recover from relatively low numbers once threats, such as harvesting and egging, are removed," the researchers write.