What bird species laid these eggs in my garden?

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A user discovered a clutch of three eggs in their front garden in Toronto, close to the sidewalk and a park. The eggs are solid white with a slight green tinge, measuring 55mm long and 40mm in diameter, resembling chicken eggs but smaller. No nest was found; the eggs were nestled in mulch. The user speculates they might belong to a Mallard duck, noting that a duck had previously been trapped in their gazebo and that their garden attracts birds due to a small pond. The eggs were warm due to the sunny weather, and the user moved one but returned it to its original spot. There was some discussion about the appearance of the eggs, with comparisons made to grocery store eggs and aggie marbles.
DaveC426913
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Found this clutch of eggs in my front garden today, not 2 yards from the sidewalk.
Have never seen any large bird take an interest in garden.

Count: 3
Colour: solid white, maybe a faint tinge of green, like the heron egg in this pic. No speckles. Matte finish.
Size: 55mm long, 40mm in diameter*
Shape: Pretty chicken egg shaped - a pointy end and a round end
Nest: None. Just nestled into the mulch of my flower bed.
Location: Toronto, 200 yards from L. Ontario shore parkland.
Time: Late July

* so, a little smaller than a chicken egg (62x45). Too small to be duck; way too small to be goose.
 
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I think they've been abandoned. I've never seen any bird near my front garden. For all I know, they've been there since spring.
 
Are/were the eggs warm?
 
BillTre said:
Are/were the eggs warm?
Well, it's about 27C (80F) here and - while it's a pretty hazy day - there's still direct sun, so they're warm like everything else is warm.
 
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DaveC426913 said:
maybe a faint tinge of green, like the heron egg in this pic. No speckles. Matte finish.
So, don't you have a pic of the ones you found?
 
dlgoff said:
So, don't you have a pic of the ones you found?
Well oops.

Attached.
(Yes, I moved one and put it back. Don't judge me.)
 

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dlgoff said:
The one on the left reminds me of aggie marbles.
?? They're solid white with no markings. They could pass for eggs from the grocery store.
 
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DaveC426913 said:
?? They're solid white with no markings. They could pass for eggs from the grocery store.
Okay. The one on the left looked like it had some colored markings on it.
 
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