https://farmandanimals.com/can-you-eat-bird-eggs/

Are All Bird Eggs Edible? Actually no, not all bird eggs should be eaten due to some birds being toxic. These birds include ones that eat insects causing the birds skin, feathers, and dander to contain the same chemical found in poison dart frogs, Batrachotoxinin-A or BTX:

Hooded Pitohui – from New Guinea. Northern Variable Pitohui – from New Guinea. Blue Capped Ifrita – From New Guinea. Little Shrikethrush – from Australia. Because these birds all sit on their eggs, even touching them would probably be a bad idea.

Other toxic birds include:

Red Warbler – from Mexico Spur-winged Goose – from Sub-Saharan Africa

Some of them only once

Butter isn't much better in inflationary terms, it's becoming a luxury. I'd rather go without than use margarine.

Shame there's a letter e right there in the thumbnail. You'd think the publishers could've gone the extra mile