Which sentence is correctly punctuated?

The cat leapt onto the window sill in a blur; however, the lizard escaped through a gap in the screen.

From outside the lizard taunted the frustrated cat, regardless, the cat maintained its pouncing stance.

Hunting prey takes much practice and patience as a result; successful hunts are few.

Keeping cats indoors is better for them however, few realize it's also better for the birds.