tussilago - cough
farfara - coltsfoot
petasites - broad rimmed hatsagittatus - like an arrow head
Both are coltsfoot, I spotted the yellow one, that doesn't grow here, in the botanical garden in Toronto on May 2 2014.
And for the bees, they are both bumblebees, but the one with the orange bum, smaller and more slender, and the wings larger in proportion.
And the snail... i leave that up to you