What type of animal lays a poisonous egg?

A web search for 'poisonous eggs' turned up the following:

The eggs of cabezon are poisonous to marine life. Consumption of cabezon roe has produced near fatal results in humans.

The milt (sperm) and roe (eggs) of gar fish are supposedly poisonous to warm blooded animals. This is a natural defense mechanism that provides protection against egg predation.

Nudibranch eggs are often poisonous.

The eggs of the South American Harlequin frog contain poison.

The eggs of the cane toad are also poisonous.

The South American Harlequin Frog's eggs are poisonous.

https://en.wikipedia.org/wiki/Harlequin_Poison_Frog