The Electronic Pet Door, opened by the "Pet Key" that attaches to your pet's collar.
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And that helps my goldfish how?Give it a few years of evolution and you'll be thanking Elkid.
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But it still don't keep out the dead squirrel old Rover decides to bring in for a late evening snack! 8O
...never did like the thought of those doggie doors.
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There was a site a while back that showcased a guy that had developed a locking pet door based on the profile of your pet's head. If the profile/shadow had anything extra hanging out of it's mouth, the door wouldn't unlock.
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That's neat. Unfortunately I don't think there are any suitable models for hamsters, salamanders (and other amphibians), birds, fish, or stick-bugs.
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But then the roaches would demand to be let in too, and that's where I draw the line! 8O
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