What bird species laid these eggs in my garden?

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The discussion centers around identifying a clutch of three solid white eggs found in a garden in Toronto, located near Lake Ontario parkland. The eggs measure 55mm long and 40mm in diameter, resembling the shape of chicken eggs but are smaller. The user speculates that the eggs may belong to a Mallard duck, given their size and the proximity to water sources that attract birds. The eggs were found nestled in mulch without a nest, raising questions about their warmth and potential abandonment.

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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.