I think this is pretty stupid. The reason you don't see the bear is exactly the reason you would see a cyclist. The bear blends in, he is dark and moves at the same speed as the other dressed in black. A bicycle on a high-street is very clearly visible, because its shape, colour and movement pattern are completely different from the cars'.

Also, it is well-known that it is much easier to spot moving things in your perifery than in your centre of vision.