The elephant brain weighs about 6,000g.
274
Dolphins have names for one another.
18
Nicole Kidman is scared of butterflies.
65
Travis was a chimpanzee who socialized with humans since birth. He could log onto a computer to look at pictures, watch TV using a remote control, brush his teeth, feed hay to his owner's horses, water plants, and learned the schedule of passing ice cream trucks.
11
Cats and dogs can hear ultrasound.
350
Cats recognise the voice of their owner, but never evolved to care.
22