Bit of a blast from the past but i certainly enjoy solving these visual puzzles. Google images has hundreds of them
http://www-ai.ijs.si/sirds/bird.jpg What do you see and what kind?http://www-ai.ijs.si/sirds/bird.jpg
http://www-ai.ijs.si/sirds/bird.jpg What do you see and what kind?http://www-ai.ijs.si/sirds/bird.jpg