assalamu alaikum,
Some people in different countries around the globe find snails and slugs a delicace...
Snails and slugs are of two types: one is Sea type other is the land type...
Sea snails are halal to eat:
“Lawful to you is (the pursuit of) water game and its use for food — for the benefit of yourselves and those who travel”
[al-Maa’idah 5:96]
al-Bukhaari narrated from Shurayh, the companion of the Prophet (peace and blessings of Allaah be upon him), that he said: “Everything in the sea is madhbooh (slaughtered).”
Majority of scholars have ruled Land snails and slugs Haram as they come under the categorie of "insects and vermon"
while the minority have said it is halal because it comes under the same rulings as locusts...
To what i understand they have based their rulings on what type of creature it is and slaughtering.
Personally i would put the creature back to its natural habitat and find a more suitable alternative to eat
Mind you slugs could be full of Protein...