Richard Du Toit / Giraffes (Giraffa camelopardalis) socialising, head to head. Itala Game Reserve, Kwa-Zulu Natal, South Africa.
01296261
Ingo Arndt / Sea trout (Salmo trutta trutta) alevin just hatched with full yolk sac, Europe
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Tony Wu / Hairchin goby (Sagamia geneionema) eggs. Though still early in development, individual transparent fish embryos are visible attached to the yellow-orange yolk sacs. Miho, Shizuoka Prefecture, Japan, P...
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Tony Wu / Flamboyant cuttlefish (Metasepia pfefferi) close up of egg with the developing juvenile attached to its yolk sac and visible inside the egg, Lembeh Strait, North Sulawesi, Indonesia
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Andy Sands / Large white butterfly (Pieris brassicae) close up side view of newly laid eggs showing yellow coloured yolk inside, UK, captive . Focus stacked image - sequence 1 of 2
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Laurie Campbell / Common / Viviparous Lizard (Zootoca vivipara) young breaking free from egg membrane it was born in. This species can both give birth to live young in a thin membrane and lay eggs. Burnmouth, Berwicks...
01536007
Laurie Campbell / Common / Viviparous Lizard (Zootoca vivipara) young breaking free from egg membrane it was born in. This species can both give birth to live young in a thin membrane and lay eggs. Burnmouth, Berwicks...
01536006
Laurie Campbell / Common / Viviparous Lizard (Zootoca vivipara) young breaking free from egg membrane it was born in. This species can both give birth to live young in a thin membrane and lay eggs. Burnmouth, Berwicks...
01443128
Tui De Roy / North Island Brown Kiwi (Apterix australis mantelli) captive newly hatched chick still carries large yolk reserve after 70 days incubation. Otorohanga Breeding Centre, New Zealand.
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Nick Upton / Yolk and developing embryo visible in Mermaid's purse egg case of Lesser spotted catshark / Dogfish (Scyliorhinus canicula) entangled with Coralweed (Corallina officinalis) in a rockpool. Rhossil...
01400133
Nick Upton / Yolk and developing embryo visible in Mermaid's purse egg case of Lesser spotted catshark / Dogfish (Scyliorhinus canicula) entangled with Coralweed (Corallina officinalis) in a rockpool. Rhossil...
01400132
Nick Upton / Yolk and developing embryo visible in Mermaid's purse egg case of Lesser spotted catshark / Dogfish (Scyliorhinus canicula) entangled with Coralweed (Corallina officinalis) in a rockpool. Rhossil...
01295712
Michael D. Kern / California gull (Larus californicus) predating an egg, San Francisco Bay, USA, SFBBO Gull Count SFBBO Gull Count, May 2009
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Tim Laman / Antarctic / Subantarctic / Brown skua (Stercorarius antarcticus) feeding on Gentoo penguin egg, Antarctica, January
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Tim Laman / Antarctic / Subantarctic / Brown skua (Stercorarius antarcticus) feeding on Gentoo penguin egg, Antarctica, January
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Ingo Arndt / Amu-Darya Trout (Salmo trutta trutta) egg with alevin already visible through egg-shell, Europe
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Ingo Arndt / Brown Trout (Salmo trutta) alevin hatching from egg with full yolk sac, Europe
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Tui De Roy / North Island Brown Kiwi (Apteryx australis mantelli) newly-hatched chick still carrying a large yolk reserve after 70 days of incubation, Kiwi House, Otorohanga Breeding Facility, New Zealand
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Fred Bavendam / Egg-yolk Jellyfish (Phacellophora camtschatica), Saanich Inlet, British Columbia, Canada
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Shane Gross / Plainfin midshipman (Porichthys notatus) fry, still attached to yolk sacs in nest in the intertidal zone, Vancouver Island, British Columbia, Canada, Pacific Ocean.
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Shane Gross / Plainfin midshipman (Porichthys notatus) fish fry still attached to their yolk sacs hidden under a rock in the intertidal zone, Vancouver Island, British Columbia, Canada, Pacific Ocean.
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Shane Gross / Plainfin midshipman (Porichthys notatus) fish fry still attached to their yolk sacs hidden under a rock in the intertidal zone, Vancouver Island, British Columbia, Canada, Pacific Ocean.
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Shane Gross / Plainfin midshipman (Porichthys notatus) fish fry still attached to their yolk sacs hidden under a rock in the intertidal zone, Vancouver Island, British Columbia, Canada, Pacific Ocean.
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Shane Gross / Plainfin midshipman (Porichthys notatus) male, guarding fish fry still attached to their yolk sacs, hidden under a rock in the intertidal zone, Vancouver Island, British Columbia, Canada.
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Shane Gross / Plainfin midshipman (Porichthys notatus) male, guarding fish fry still attached to their yolk sacs, hidden under a rock in the intertidal zone, Vancouver Island, British Columbia, Canada.
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Shane Gross / Plainfin midshipman (Porichthys notatus) fish fry still attached to their yolk sacs hidden under a rock in the intertidal zone, Vancouver Island, British Columbia, Canada, Pacific Ocean.
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Shane Gross / Plainfin midshipman fish (Porichthys notatus) fry attached to yolk sac under a rock in intertidal zone, Vancouver Island, Canada, Pacific Ocean.
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Fred Bavendam / Pacific giant octopus (Enteroctopus dofleini) larvae, one carrying the remnants of egg yolk that nourished it during incubation, floating around egg strand, British Columbia, Canada, Pacific Ocean.
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Tui De Roy / Olive ridley turtle (Lepidochelys olivacea) hatchling just hatched from egg with yolk sac still partly exposed, Oaxaca, Mexico.
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Shane Gross / Fried egg jellyfish (Phacellophora camtschatica), portrait, Vancouver Island, British Columbia, Canada, Pacific Ocean.
Yves Lanceau / Domestic crossbreed hen (Gallus gallus domesticus), chick embryo developing in egg, more blood vessels visible and the embryo begins to digest the yolk, 3 days, sequence 3/10
Nick Upton / Lesser spotted catshark / Dogfish (Scyliorhinus canicula) embryo attached to yolk inside egg case of in a rockpool, The Gower, Wales, UK, September.
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Shane Gross / Fried egg jellyfish (Phacellophora camtschatica) off Vancouver Island, Canada
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Nick Upton / Close up of yolk and developing embryo visible in Mermaid's purse egg case of Lesser spotted catshark / Dogfish (Scyliorhinus canicula) in a rockpool low on the shoreline, The Gower, Wales, UK, Se...
01668408
Nick Upton / Yolk and developing embryo visible in Mermaid's purse egg case of Lesser spotted catshark / Dogfish (Scyliorhinus canicula) in a rockpool low on the shoreline, The Gower, Wales, UK, September.
01647885
David Hall / Fried Egg Jellyfish (Phacellophora camtschatica) viewed from below; Browning Pass, Queen Charlotte Strait, British Columbia, Canada. September.
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David Hall / Fried egg jellyfish (Phacellophora camtschatica) Nigei Island, Queen Charlotte Strait, British Columbia, Canada. October.
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David Hall / Fried egg jellyfish (Phacellophora camtschatica) Nigei Island, Queen Charlotte Strait, British Columbia, Canada. October.
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David Hall / Fried Egg Jelly (Phacellophora camtschatica) with juvenile Rockfishes (Sebastes spp.) Nigei Island, Queen Charlotte Strait, British Columbia, Canada, September.