Echidnas are part of a group of egg-laying mammals called monotremes.

VOA: special.2009.07.07

He's asking us to imagine God, or perhaps this is God's creative spirit, as some sort of feminine being laying the universal egg and brooding over it until it bursts forth with new life. This is a risk.

他想让我们把上帝，或者说上帝的创造精神，想象成一个产下宇宙之卵并孵伏其上,直到新生命破壳而出的女性形象，这很冒险。

耶鲁公开课 - 弥尔顿课程节选

"The female cowbird sneaks around the forest, laying her egg in other species' nests, " Stutchbury said.

WSJ: Northeast drilling boom threatens forest wildlife

According to the firm, bird numbers would be comparable with the site's use as an egg laying unit.

BBC: Bleasby Moor Against Development group

Campaigners have vowed to fight plans to convert an egg laying unit in Lincolnshire into a site for breeding chickens for slaughter.

BBC: Bleasby Moor Against Development group