Identifying, gathering and processing some Ostrich ferns or Fiddleheads. Also enjoying the nice weather and birds. Please be safe with wild edibles, this fern does have some similar species to it, be 100% sure of your identification and learn from experienced people in your community as much as possible. Please do not overharvest this plant as you are harvesting the leaves, overharvesting could eventually harm the plant. I forgot to mention, you can also boil the fiddleheads in two changes of clean water to be absolutely sure the toxins are out, the heat of one boil is fine but 2 is just an extra precaution.
This website explains very well the storage and cooking process: https://www.ontariowoodlot.com/publications/featured-articles-news/harvesting-fiddleheads-on-woodlots
For more information on the Ostrich fern :