Enjoying springtime in the Arboretum - pollinators visiting squill flowers

I went to the Fletcher Wildlife Garden and the Arboretum today hoping to photograph bees visiting flowers, since I know that Siberian squill (Scilla siberica) should be flowering by now and they usually get visitation from pollinators (based on last year's observation).

At the Arboretum, there were many birds species.  Here are some of them:

Northern Cardinal (Cardinalis cardinalis)
Male Northern Cardinal (Cardinalis cardinalis) keeping an eye out for his female companion.

Northern Cardinal (Cardinalis cardinalis)
The female cardinal.

Northern Cardinal (Cardinalis cardinalis)
Another picture of the handsome male.

Song Sparrow (Melospiza melodia)

White-throated Sparrow (Zonotrichia albicollis).  I think the yellow lore and white throat patch makes them that much more interesting than White-crowned Sparrows (a species that I will be seeing quite frequently in Colorado in five weeks).

I'm guessing this is a House Finch (Haemorhous mexicanus) because in my other photos of the same individual, the red is only restricted to the head and the breast regions.

At the Arboretum, I found a nice patch of Siberian squill and spent almost an hour there just photographing flowers and bees (a lot of them)!

Siberian squill (Scilla siberica)
Pretty flowers despite it being an invasive species.

An Osmia bee visiting squill.

Osmia bee visiting squill

An out-of-focus image.

Resting Osmia bee
Resting after nectar-drinking.

Andrena bee on squill
An Andrena bee on squill.

Andrena bee on squill
Flying away.

Greater Bee Fly (Bombylius major) on squill
A Greater Bee Fly (Bombylius major) on squill, although some flies seem to steal nectar from the topside of the flower instead (and thus not pollinating the flower at all).

Another Andrena bee.

Andrena bee on squill

Andrena bee on squill

Resting Osmia bee
Another resting Osmia bee.

Resting Osmia bee
I tracked this bee into vegetation in the substrate and waited for it to come out.  It didn't come out so I guess this was its resting place for the day.

Andrena bee on squill

Resting Andrena bee
An adorable bee.  I am calling it an Andrena bee for now, but correctly me if I am wrong.

Andrea bee on squill

Andrena bee on squill
An Andrena bee covered with blue squill pollen.

Andrena bee on squill

Andrena bee on squill
The bee trying to get some of the pollen off its head and antennae.  You can see some of the pollen being swept off the bee.

Andrena bee on squill

Andrena bee on squill

Andrena bee on squill
One last look before walking to the O-train station.

A squirrel enjoying its lunch on a bench.

Arboretum during springtime
People enjoying springtime in the Arboretum, just like everyone else.

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