Number 2.  At migration time, Canada Geese form up in larger groups.  As I was watching the above video, I was thinking about the geese.  We always have a mating pair just down the road at the lagoon.  They come back year after year.  This year,  we noticed that the family group of 6 - 8 was joined by  other geese to make the group about 20-25.  I wondered if they were the siblings of the mating pair with their new families.  About a week or two later, our group was gone but the about a half a mile down the road was a much bigger group of geese.  My assumption was they were preparing for migration.

We were coming thru a town in NY in the fall 2 years ago and noticed as it approached dusk that a bunch of crows were flying into town from ALL directions!   We started following and looking for the flock - literally THOUSANDS of crows were coming into one area of the town near the railroad tracks.  We got a bunch of photos and videos and reported it on iNaturalist and E-Bird so that if a researcher is using the data they would know where the flock was congregating.   It was LOUD and amazing to watch them socializing and preening before going to sleep.

No large flocks, I mostly see crows in the winter at the feeders

I've seen foraging flocks in fields in winter months but unsure how I could estimate the size.

I live on Malcolm Island, a small island off of the northern tip of Vancouver Island in British Columbia.  Flocks of crows are common year-round, frequently foraging on the beach at low tide and around the deciduous trees and conifers above the beaches.   These are the typical BC coastal beaches: quite rocky, covered in seaweed, with piles of logs at the tide line (these float in off barges).  The climate here is mild year-round compared to other parts of Canada, although the wind and rain storms from November through February are quite strong.   The crows move off the beaches during those months whenever a big storm comes in, but otherwise forage on the beaches all winter long.  They frequently and fearlessly harry the bald eagles that roost in trees by the water, sometimes in groups of 3-5 crows but often one-on-one.  The eagles are clearly annoyed but I've never seen any aggression by eagles toward crows.  Ravens are common here, more so in forested areas than on the beach.  The crows are afraid the ravens.   Vehicular traffic is thankfully very limited here and small flocks of crows frequently forage along the small road that runs parallel to the beach.  Average size of flock around my house: 20 -30 crows.  Our house fronts the beach. We have a resident bonded pair that nests in a very tall cedar hedge on one side of our property.  They spend many hours sitting at the top of a weeping beech down by the water's edge. Flocks of crows also gather by the ferry dock and down at the harbour where the fishing boats and recreational boats dock, as do gulls. We have fewer large flocks of gulls here than I expected, although that may be true just in our particular west-facing area of Malcolm Island.   I've seen large flocks of crows at other ferry terminals around Vancouver Island, even the more urban ones.  I've not noticed any sick looking crows here.  As for other large flocks of birds, this morning I was lucky enough to see a flock of 20 or so American White Pelicans on the water in font of or house - very rare visitors, as they nest at a lake in the BC interior.  Last summer white pelicans were sighted around Victoria, in the southern tip of Vancouver Island and mid-Island around Nanaimo, but our location is pretty far north.  What an amazing sight to see them rise from the water! Other flocking birds here: starlings.

We have crows in a backyard park. They seem to be here all year round but they appear in family groupings. The largest flocks I know of are in Bothell where they roost in the winter.

We see them family groups most of the year, but flocks most commonly late fall and winter.  The group up and fly into Glens Falls to take advantage of the urban heat bubble and range out onto agricultural fields in Washington County for food.  Of course Canada geese, in southern Washington County we see snow geese, Starlings, pigeons, and this year we have a flock of about 60 red wing black birds stop at the feeders in front of the office.

A few days ago I watched a group of about 10 crows playing around in the woods behind my house. Their kept going between my leaf litter and the trees. I have learned over the years to watch where they frequent in my yard, it can tell me where a hen was laying "hidden" eggs, and unfortunatly where a rabbit nest had been. They also love to forage around in my compost pile.

A few years back I was in Augusta Maine by the mall about  5:00 or 6:00 pm  it was an amazing sight.and saw a very large flock of crows flying in. There were hundreds of the. It was winter time.

1. No foraging flocks in the city that I’ve noticed.  Only family groups. 2. Have in the past seen large groups of waxwings fly through my end of the city, can’t recall time of year.  More recently (fall and winter) there have been small flocks of yellow finches stopping at my feeders.

I live in a rural area with large farms with fields that are gleaned aggressively by flocks of crows in the fall.  The largest flock I saw was in the 20 to 30 range.  There is a main family group in my neighborhood that makes several rounds each day.  The family. Visits my yard everyday in the late morning to early afternoon.  Three to five forage for bits of seed, peanuts and suet that I place for song birds.  If I walk in my neighborhood I am followed by at least one crow who announces my presence.  Sometimes one or two will follow me around to keep tabs on me.  

1.Recently, I have seen a large flock of crows that roosted in the fir trees . It was near the sidewalk and near  people's houses. There were about 200 individuals. 2. I have seen a big flock of brewer's blackbirds around the parking lot near the mall.

Recently, I travelled to coastal Washington and BC for a birding trip, and I was amazed at the sheer numbers of birds flocking in certain bays, presumably good feeding spots. I saw hundreds of dunlin, Western sandpipers, and thousands of American wigeon - I would guess 3000-5000 in places.

I have observed crows foraging in several locations around the area that I eBird. The golf course is one favorite place where they walk about finding food in the rough margins of the fairways.  I have also noticed crows on the dam holding back the lake. They forage on the top in the grass and sometimes among the rocks of the rip-rap. They also seem to spend time in the fenced-in area to the water treatment plant behind the dam. What they are finding for food is a mystery to me. I also see large flocks of Canada geese on the lake at various times of the year. Ducks, dabbling as well as diving, migrate through two times a year and use the lake for a day or two possibly as a resting stop.

A little note on crows and their peskiness. Recently I completed a season of work on a farm that grows garlic. The "seed" garlic cloves are planted in late October (here in South-Central Ontario) to produce the next year's crop. We had some trouble with crows (or possibly ravens also, there is a family group that nested on one of the farm's old silos) coming along and plucking out the cloves only to dump them back on the ground. The question is: why? They didn't eat them, and there doesn't seem to be anything to be gained from pulling them up. Plenty of earth was already being turned over by the tractor plow preparing rows for planting so searching for something where the garlic was planted doesn't seem plausible.

The biggest flocks I've seen are Pigeons, Grackles, and Eurasian Collared/Mourning Doves and these 3 groups semi-coexist to my surprise.

Growing up in Maryland we had lots of crows and ravens. Out here in South Dakota I mainly see grackles. I will be looking for them as I go birding. Most interesting and intelligent birds. I am enjoying the course!

Growing up I used to see flocks of Canada geese flying overhead in the famous V formation, calling out as they did so. They would stop at my local lake and children would often get chased by them, though the geese would also be harassed by people too. These were probably groups of 7 to 10 birds.

1. I have seen crows flocking in my area, but the reason for the flock has mainly been for roosting. I think the times I have seen crows together in a flock for foraging are usually family groups, as there are only a few members and they are usually in areas where I suspect the crows to be nesting.   2. When visiting Texas once, I got to experience seeing Grackles form their large winter flocks.

I've had large flocks of waxwings come in during fall migration.  They land on the trees and strip off all the fruits then take off.  Starlings have done it too.

I have observed sizable groups of robins and waxwings converging onto trees or bushes with berries during the winter.

In the wintertime, it is chocked full of crows on the golf course not far from my home. they like standing near the sandtraps, eating. it's interesting to note that they're not the same crows every time, which is what I assumed. Canada Geese also like to meet up there, but never at the same time. the group of crows is probably 50 or 60 birds.

I have seen a large flock which comes day after day to the same venue winter and summer.  I have a couple of them who visit my planet boxes daily at roughly the same time.  Ther e are no changes to the boxes and they make the same rounds daily.  I have also watched one individual observe a bluejay walk about my roof looking for just the right place to hide his goodie.  He finally found the right spot and cached his mor sel and flew off. Within a minute a crow appeared and followed the exact route of the bluejay, found the tasty morsel, snagged it, and then flew off with his prize.  I was fascinated and most impressed and decid Ed to learn more about crows.  They certainly are worth watching!  

1.  Yes on two occasions, I have seen large foraging flocks.  The first time I noticed hundreds of birds in smaller groups flying over downtown Akron, Oh.  All we’re headed in the same direction.  I didn’t see their final destination. The second time all these crows were meeting in a large open field near Goodyear aerospace in Akron Ohio. Hundreds of them. Both times it was during the fall and winter. Made me wonder if they don’t get together every night somewhere to spend the night. They all seem to start flying around 4:30 in the afternoon. 2.  I have never seen other large groups of birds like this, I’ve only seen large groups of migrating birds.