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Parthenogenesis in vertebrates

Apparently a female hammerhead shark has given birth without being
fertilized by a male:

This is the first evidence of parthenogenesis in a chondrichthyan, apparently.

The article states: "Dr Paulo Prodohl [said], '...The discovery that
sharks can reproduce asexually by parthenogenesis now changes this
paradigm, leaving mammals as the only major vertebrate group where
this form of reproduction has not been seen.'"

And: "This unusual reproductive ability, known as parthenogenesis, is
only very occasionally seen in some vertebrate groups such as birds,
reptiles and amphibians."

I'd heard many times of squamates that can reproduce
parthenogenetically, but which birds can? Can any non-squamate
sauropsids (turtles, crocodylians, tuataras)?

Is it males being heterozygous that prevents mammals from reproducing
Mike Keesey