need help ID shrub

We have this awesome shrub in the backyard and we don't know what it is! We are in Alberta, zone 3 and it must be native. Lots of growth every year and some pop up (by seed) on other corners of the backyard. We love it!
The branches are reddish brown, leaves turn bright yellow and red in fall and the berries are black. I am thinking it has small white flowers but I am not sure.

Here are some current pictures (spring):





Anybody know what that is?

Is it thorny?

Cj Verde wrote:Is it thorny?

nope

why do you think it is native?
what do the seeds/ fruits look like?

maybe privet? Do the flowers smell kind of nice? Your comment about it popping up everywhere makes me think of privet, that and the picture you posted looks like it, I think. here is one of privet blooming. I think it is planted as a hedge because of its fast growth....I like it's big bushy unpruned shape. I think birds like the seeds but am not sure about pollinators to the flowers although their sweet smell should attract them.

I found out that it's a cottoneaster.
Thanks everybody.