Ane Christensen and husband John McClusky told the Toronto Star why the mallard chose one of their garden boxes last weekend was a mystery.

"Why would a duck fly seven floors up in the air to build a nest?" Christensen said. "It's just so strange and it's not duckling friendly" as far as access to water.

Toronto Humane Society spokesman Lee Oliver agreed.

"Ducks normally nest on the ground or next to a tree but not in the tree," he said.

The couple said they plan to buy and fill a plastic wading pool and build a ramp from its edge to the floor for the ducklings,

Christensen told the Star that's likely only going to be a temporary solution.

"It really would be fun to raise ducks but I'm sure our neighbors wouldn't want their decks to become poop decks," she said.