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It seems likely that the developers no longer wanted them to be part of the game mechanics, but wanted to show the player that they were, in fact, still on Earth.

Leaked beta files suggest that the icthyosaur originally had the same purpose as leeches (devouring the player if they venture into deep water), it's possible that the single appearance in the teleport malfunction was intended to be a warning to the player that was simply never removed. And giveing refrence that some of the half life aliens (bullsquid,houndeye) are somwere but just cannot be found

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