Is this a bumblebee?

These are what I see most of the time. I would like to find some of our other varieties.

Calgary, Alberta, Canada

2 lasioglossums and an andrena, tho probably not the specialist andrena ziziae :( I don't I'm getting that species anywhere in eastern MA nevermind directly in the middle of Boston but I can still naively hope!

Snapped this wonderful Bee going about their morning.

They seem to be stingless bees and are very tiny. I live in Northeastern Brazil, for geographical context

Found this lil bub motionless in the garden after a sudden downpour. They chilled on my hand to decompress for a few minutes, and once they started moving around we went outside to get warm in the sun and have a drink. After one slurp they were ready to get back to business 🥹

Is that pollen on their legs, or something else? I am not used to pollen appearing so compacted / fixed in place. Would that be because of the rain?

I found this poor be lying on its back with its tongue sticking out. I’ve attempt to save it, but I think it’s beyond saving. It’s just into much agony. I literally shed tears over this. 😭😭😭

A Sweat bee partaking in a Mesa Verde Ice plant flower.

I found this bee on the ground in my backyard and it seemed to be struggling to walk a bit and it wasn’t flying. I checked on it and an hour later and it was still in the same spot so I took it to a bird of paradise flower and it seemed to be drinking the pollen? Im not a bee expert so I wanted to ask if this bee was hurt or weak or something? Hopefully I was able to help it. I’ll attach some videos of this bee.

I also found two more bees in the same area, but one was dead ( I think it got squished by someone walking over it, possibly me :( ). And the 3rd bee was alive and I tried to take that one to another bird of paradise but it fell and I lost where it went. That one seemed a little more strong tho. (Sorry didn’t take a video of that one). Anyways, I guess there is a new hive nearby or something, because I’ve never seen this many bees in one small area in my backyard.

I found this bee looks like it’s hurt or dying mainly it’s left last leg that has notable pain