PREMAPHOTOS / Uloborus lugubris spider (bottom) mimics leaf in web with egg sac (top left) Sulawesi

PREMAPHOTOS / Pond pirate spider with egg sac {Pirata piraticus} on pondweed, England, UK

PREMAPHOTOS / Huntsman spider female carrying eggsac. Sumatra {Heteropoda sp}

Duncan Mcewan / Spider {Araniella sp} guarding egg sac on Oak leaf Scotland, UK

PREMAPHOTOS / Wolf spider female with young emerging from eggsac on back {Pardosa prativaga} UK

PREMAPHOTOS / Myrmecium ant mimic spider spinning egg sac. Costa Rica

Philippe Clement / Wolf spider {Pardosa amentata} carrying egg sac Belgium

Dietmar Nill / Wolf spider with egg sac {Lycosidae} Bulgaria

Gerry Ellis / Solomon Island Leaf Frog (Ceratobatrachus guentheri) egg sac, Woodland Park Zoo, Washington

Gerry Ellis / Wandering Spider (Cupiennius coccineus) with egg sac, Mesoamerica

Gerry Ellis / Wandering Spider (Cupiennius coccineus) with egg sac, Mesoamerica

Mark Moffett / Cave Tarantula with egg sac, Mexico

Mark Moffett / Tarantula (Megaphobema sp) female holding egg sac, Iquitos, Peru

Mark Moffett / Tarantula (Megaphobema sp) female holding egg sac, Iquitos, Peru

Jeff Rotman / Spined pygmy shark + egg sac {Squaliolus laticaudus} deepsea, Mediterranean

E.A. KUTTAPAN / Tiger with python prey, Bandhavgarh NP India. Tiger ate only the egg sac and her cubs played with the carcass.

Nick Upton / Egg sac of Shelled sea slug (Acteon tornatilis) exposed on a low spring tide on the shore of a sandy beach, Rhossili, The Gower Peninsula, UK, July.

Chris Shields / Illustration of Wolf spider (Pardosa lugubris).~Female (left) is carrying egg sac; male on right.

Premaphotos / Garden spider (Araneus diadematus) spiderlings in a ball after hatching from the egg-sac on Beech tree, UK

Premaphotos / Grass spider (Tibellus oblongus) guarding her egg-sac, UK

Premaphotos / Mothercare spider (Theridion sisyphium) female guarding her egg-sac, UK

Premaphotos / Green lynx spider (Peucetia viridans) female guarding her egg-sac on a Prickly pear cactus, in desert, Mexico

Premaphotos / Wedding present / or Nursery-web spider (Pisaura mirabilis) female holding her egg-sac in her jaws, UK

Premaphotos / Dune wolf spider (Xerolycosa miniata) female carrying her egg-sac on sand dune, UK

Premaphotos / White-spotted pirate spider (Pirata tenuitarsus) female with her egg-sac, UK

Premaphotos / Ant-mimic spider (Myrmecium sp) female spinning her egg-sac on a leaf in rainforest, Costa Rica

Premaphotos / Spider female (Alpaida bicornuta) guarding her egg-sac beneath a leaf in rainforest, Costa Rica

Premaphotos / White-spotted pirate spider (Pirata tenuitarsus) female with her egg-sac, UK

Premaphotos / Green orb weaver spider (Araniella cucurbitina) female guarding her egg-sac, UK

Premaphotos / Spotted wolf spider (Pardosa amentata) female with her egg-sac, UK

Premaphotos / Earth chaser spider (Trochosa terricola) female carrying her egg-sac, UK

Premaphotos / Brazilian wandering spider (Phoneutria fera) female guarding her egg-sac, which she has camouflaged with bits of dead leaf. A very poisonous genus of spider, in rainforest, Brazil

Premaphotos / Spotted wolf spider (Pardosa amentata) female with her egg-sac, UK

Premaphotos / Mouse spider (Herpyllus blackwalli) female with her egg-sac, UK

Premaphotos / Spotted wolf spider (Pardosa amentata) female with her babies climbing onto her back as they hatch from the egg-sac she is carrying attached to her spinnerets, UK

Premaphotos / Spitting spider (Scytodes thoracica) female with egg-sac in a house, UK

Premaphotos / Southern black widow spider (Latrodectus mactans) female in her web with an egg-sac also present, Georgia, USA

Dietmar Nill / Wolf spider with egg sac {Lycosidae} Bulgaria

Duncan Mcewan / Spider {Araniella sp} with egg sac on Oak leaf, Scotland, UK

Duncan Mcewan / Wolf spider {Lycosa sp} carrying egg sac Scotland, UK Inverness-shire woodlands