Does the humming bird have predators?

Snakes lurk around the feeders - I don't know if they catch any!

yes, unfortunately it was our family cat.

She knocked down the nest (that we had been monitoring as it had eggs in it) ate the eggs and then ripped up the nest in shreds.....

Gosh Darn Cat

Sorry to report our barn cats have killed a couple over the last two years.

I often wondered about that too! Thanks!

Where do they go at dark? Perching on trees, in tree holes? I know mommas would have nests for babies.

At our old house we had numerous humming birds build nests in our Leyland Cypress trees.  They weaved  tiny nests from my horse's tail/mane hair.  Those tiny nests were incredibly strong.  The  birds roost at night and go in a dormant state until sunrise.

They don't have a lot of predators as adults as many predators just aren't fast enough.  But, roadrunners can catch them fairly easily.  And, they are vulnerable to predators at night when they sleep.  The usually sleep perched on a branch or on their nests and they go into almost a comatose state, slowing their heart-rate down significantly.  Fortunately, though, they usually sleep or nest on very thin branches/leaves that most predators can't get to.

Praying mantids eat them as well.

http://www.birdwatchersdigest.com/bwdsite/learn/hummingbirds/mantis-hummer.php?sc=migrate

I rescued one that had gotten itself hopelessly tangled in a spiderweb.   I doubt the spider had any intent to eat it... but it wasn't doing it any favors either.

Don't be so sure.  Large spiders will eat them as well, or so I've read.