Here's a couple of links I found the video link embedded in the UCdavis site also lists other pests that eat young leaves like caterpillars, grasshoppers, earwigs, katydids, and weevils and have descriptions on signs to look for.
I rarely have caterpillars in my garden. I occasionally find locusts, but not this time of year. I do have a 'wet' garden with lots of hiding places. I find slugs and snails hiding in mulch, grass, weeds, under pots, in the pots (they crawl in through the drain holes and slugs and snails have no problem climbing trees, fences and benches. When I see seedlings on my benches getting chomped on, I have to check every pot for slugs in the bottom of the pots and I put bait under the bench and in cups on top of the bench. I have even had slugs and snails climb my Portuguese kale and meyer lemon branches to get on top of my bench. I don't always see slime trails but early in the morning and in the evening they come out and I spot them on the sidewalk and on the grass. They prefer young seedlings and new growth and will eat the roots of older plants. Beetles are usually responsible for the holes in the tall plants like the beans and corn but it looks different. There are more holes, the edges are not as smooth and the leaves are usually older than what the snails prefer. Cut worms are caterpillars that will eat through a stem of a young plant and drop it like a tree in a forest. Then come back and eat what has fallen.
I switch baits because after a while, I find the slugs start refusing the bait. I have used beer or yeast traps but they require more maintenance. The board works but the board has to be checked every morning. Deadline works as a barrier but loses effectiveness after it dries. I try to limit methaldehyde in the vegetable garden so I use it more in the ornamentals and around the perimeter of the vegetable garden or I put the bait in containers in the garden (a cup tipped on its side). Iron phosphate is not attractive to pets. It seems to decrease the visibility of the snails and slugs but I don't find as many dead bodies as I do with the other baits.
For every slug and snail you see there are probably 20 that you missed.
I have African snails which can get really big, very small bush snails that are not easy to spot, and three different kinds of slugs. I do have cannibal snails and those are the only ones that I leave alone.
https://www.hungrypests.com/the-threat/g ... -snail.php