Can you show some research on that claim?...Having observed a puppy gleefully searching new stuff found in his territory...I'm uncertain that we could claim they were non-curious.

Number of species according to Wikipedia: at least 7 million, of which:

• at least 5 million (71%) are bacteria
• 1,203,375 (17%) are invertebrate animals
• 297,326 (4%) are plants
• 59,811 (0.8%) are vertebrate animals, of which 5,416 (0.07%) are mammals (the category that includes humans, chimpanzees, dogs, and every other species to which the emotion of "curiosity" might conceivably be attributed).

"Species" != "things like cute puppies".