Based on personal experience, (and this has probably been reiterated time and time and time and time and time again (lol redundancy is great) on macinsiders), a bird course for one person isn't necessarily a bird course for another person.
For instance, as a Science student, I was under the impression that Econ 1B03 and 1BB3 were super easy. They are, don't get me wrong, but the thing is, I got really lazy and ignored these courses under the ruse that they are "bird courses". The only reason any course is a "bird course" is because based on a majority, it has generally given high marks.
Looking for a "chill course" is probably non-existent now that you're in university. EVERY course will require at least 3/4 hours a week (in addition to class) of serious devotion whether or not it is a "bird course" or not.
So I'm warning you now, don't take a course simply because it is "easy", it wouldn't be a university course if it doesn't take some sort of effort.
With that said, if you really like basic math and repetitive (ie. doing tons of practice questions to get something right) learning, take Stats 1CC3 (easy 12 if you're into math). But since you're already taking 2 other math courses, you may want to try Environmental Science 1A03, Geography 1HA3, or Anthropology 1A03. These are most often (but not 100% of the time) regarded as pretty "easy", but it's up to you to ultimately decide.
Oh boy, sorry for the rambling. But good luck!