© Placental viviparity occurs in some species of shark - once the yolk sac has been depleted, it attaches to the uterine wall, acting as a pseudoplacenta. View our The yolk provides the young with the nutrition it needs to grow. Generally, shark eggs have curly tendrils at the ends or are covered in fibres, whereas ray eggs are usually squarer with horns protruding from the corners. Although the young initially rely on a yolk sac, this eventually becomes a placenta-like structure. © In some species, the female will produce unfertilised eggs, which are eaten by embryos.

© Sharks and rays are fishes with skeletons made of cartilage, grouped together in the class Chondrichthyes. “When they emerge they have to be ready to go, able to feed, able to look after themselves because we haven’t seen any evidence that the parents provide care post laying eggs.”And life isn’t easy inside the egg, either.

This is called intrauterine cannibalism or sometimes as embryophagy ('embryo eating'). (Image Credit: Angela Heathcote)A crested-horn shark egg. © A huge variety of animals produce eggs. It’s likely that you’ve stumbled across a shark egg before, but you may not realise how diverse the colours and shapes really are. (Image Credit: Angela Heathcote) Sharks that lay eggs

This is known as oophagy ('egg eating') and occurs in species including the shortfin mako (Embryos of other sharks survive by feeding on their smaller siblings. The remainder are oviparous, meaning they lay eggs.Around 40 to 50 different shark species live permanently in or regularly visit the Empty shark-egg cases occasionally wash up on coastlines around the world, including in Britain. But now, scientists have invented a crafty way to protect hatchlings.Perfect for Dads who like nature and exploring the world around us, get inspired with our range of binoculars, scratch maps and globes for Adventure Dad’s and world explorers alikeLearn about the latest wireless weather stations and smart device compatible technology and give your Science Dad an upgrade, with slick desktop and mantle gifts for all budgets, including lava lamps, storm glasses and more.Get great photography, travel tips and exclusive deals delivered to your inbox.By subscribing you become an AG Society member, helping us to raise funds for conservation and adventure projects.

“There is some work that suggests embryos in shark eggs reduce their activity when predators are present to reduce chances of predation. And there’s practical reasons for its bizarre shape.“When the Port Jackson shark lays an egg, she’ll pick it up in her mouth and screw it into rocks and crevices to anchor it, so that they don’t wash away and that’s what gives them that shape,” explains Mark.The purpose of the tendrils, he says, is to become tangled in seaweed or glued to the algae as another way to anchor the egg.According to Colin, once the sharks lay their eggs, the pups are completely on their own, subject to the weather and other predators.



However, Gilbert Percy Whitley, a celebrated ichthyologist who worked at the Australian Museum from 1925 to 1964, wrote that the only true ‘mermaid purse’ is the skates’ egg.Skates look similar to your average stingray, but without the usual whip-like tail and stinging spine, and they have more pronounced snouts.Like some sharks, skates are oviparous, producing one of the most bizarre egg shells of all –  resembling the heads of two rhinoceros beetles stuck together. © The Trustees of The Natural History Museum, London Spiral shark eggs. PLUS receive your choice of coffee table book FREE with a 12 issue subscription.TO THE AVERAGE person, the reproductive lives of Australian sharks is steeped in mystery. “There are quite high levels of predation on skate eggs – up to 18 per cent in one study – by gastropods that bore through the egg case and suck out the contents.”The winning images from the 2020 Australian Geographic Nature Photographer of the year contest have been revealed.The first week of the Australian Opal Centre and Australian Geographic fossil dig at Lightning Ridge has unearthed plenty of fossils and opals.

Females keep the eggs in their body until they hatch, then give birth to the live young.

This is an egg case of a bottlenose skate (a type of ray), housed in the Museum's spirit collection . You must be over the age of 13. This method is known as ‘intrauterine cannibalism’.
Bullhead sharks produce spiral- or corkscrew-shaped eggs.

By subscribing you become an AG Society member, helping us to raise funds for conservation and adventure projects.

Closed Monday and Tuesday except 31 August 11.00-18.00 (bank holiday)We use cookies and similar technologies to optimise your experience when using this site and to help tailor our digital advertising on third party sites. His favourite is the egg of the crested-horn shark (Without the black tendrils, it looks identical to the Port Jackson shark egg – the one you’re most likely to see at the beach. These often palm-sized eggs come in various colours, shapes and textures, depending on the species of shark.Mark McGrouther has been the ichthyology (fish science) collection manager at the Australian Museum since the late 1980s and has seen his fair share of shark eggs.

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