Stupidly easy, no challenge at all. Good for young children only. Also asked which animal is active at night. I clicked lion. Of it had bothered to ask which animal is ONLY active at night, the other answer would have been the only correct. Check reputable encyclopaedias. And you keep replying you need ads to keep going but I have never seen such a ridiculous amount of ads. And the categories are mostly product placement. How it got 4.7 I'll never know. Probably paid for fake reviews.