I’m too dumb to understand this or it’s more esoteric than I’m thinking.

Can someone help me get the jokes please?

• St Bernard = alcohol because cold ✅
• Dolphin = missing swimmers because they washed off ✅
• Rhino = pizza because you’re so hungry you eat a rhino ✅
• Beetle = pencil because??
• Chicken = floss because it gets stuck in your teeth ✅
• Snake = keys because??
• Cow = cereal because they give milk ✅