A deadly Egyptian cobra remained on the loose at the Bronx Zoo yesterday — and jittery visitors griped that they hadn’t been told about it before entering.

The 20-inch-long snake, dubbed Cobra-dini, escaped from its enclosure at the Reptile House on Saturday and hasn’t been seen since. The exhibit remained closed yesterday.

“We are confident that the snake is secure within the Reptile House,” Director Jim Breheny said. “When the snake gets hungry or thirsty, it will start to move around the building. Once that happens, it will be our best opportunity to recover it.”

Bronx resident Sylvia Cruz, at the zoo yesterday with her 8-year-old daughter, Melissa, said: “They aren’t doing a good job of alerting people about it. We went to the Reptile House and found out it was closed. It’s really scary.”