Webquest: world's weirdest creatures

The idea for this one came to me from my RSS feed [explanation] from the crazy people at BoingBoing, and looks as if it might make a neat webquest [more information].

The basis of the webquest would be to find what the following have in common:

• The long-beaked echidna ("an egg-laying mammal")
• The Hispaniolan solenodon ("a venomous shrew-like creature")
• The Bactrian camel
• The pygmy hippopotamus
• The Slender Loris ("a shy, nocturnal primate with gigantic eyes")
  

The original (which includes 10 such creatures) is a campaign by EDGE to save the "world's weirdest creatures".

I'd suggest not specifying the URL of the EDGE site, but having your learners use a search engine or online encyclopedia, like Wikipedia (otherwise it's too easy!).