Ingo Arndt / Ramose Murex (Chicoreus ramosus), Meeresmuseum Ozeania, Riedenburg, Germany, sequence 2 of 2

Paul Williams / Nephila pilipes spider and common tiger butterfly (Danaus genutia). The butterfly contains toxins that make it distateful to the spider, so the spider snips the butterfly out of its web and releases i...

Doug Wechsler / Brown lacewing (Micromus sp) larva eating Oleander aphid (Aphis nerii) on common milkweed, USA.

Doug Wechsler / Monarch butterfly ( Danaus plexippus) egg on common milkweed; Philadelphia, Pennsylvania, USA. August.

Doug Wechsler / Milkweed tiger moth (Euchaetes egle) caterpillars on Common milkweed (Asclepias syriaca) Philadelphia, Pennsylvania, USA, July.

Doug Wechsler / Milkweed stem weevil (Rhyssomatus lineaticollis) feeding on common milkweed sap Morris Arboretum, Philadelphia, Pennsylavania, USA. August.

Doug Wechsler / Oleander aphids (Aphis nerii) on common milkweed, Schuylkill Centre for Environmental Education, Philadelphia, USA July

Doug Wechsler / Jumping spider (Phidippus audax) sheltering on Common Milkweed, Philadelphia, USA

Doug Wechsler / Golden-backed snipe fly (Chrysopilus thoracicus) mating on Common milkweed leaf (Asclepias syriaca) Pennsylvania, USA, May.

Doug Wechsler / Common milkweed field (Asclepias syriaca) Morris Arboretum, Pennsylvania, USA, June.

Doug Wechsler / Common Aerial Yellowjacket (Dolichovespula arenaria) pollinating Swamp Milkweed (Asclepias incarnata( French Creek State Park, Philadelphia, Pennsylvania, USA, August.

Doug Wechsler / Large milkweed bug (Oncopeltus fasciatus) nymphs on Common milkweed (Asclepias syriaca) leaf, Pennsylvania, USA, August.

Doug Wechsler / Mating pair of Large milkweed bugs (Oncopeltus fasciatus) on Common milkweed (Asclepias syriaca) leaf, Pennsylvania, USA, July.

Doug Wechsler / Multicolored asian lady beetle (Harmonia axyridis) eggs and newly hatched larva on Common milkweed (Asclepias syriaca), Pennsylvania, USA, July.

Doug Wechsler / Great spangled fritillary butterfly (Speyeria cybele) two on Common milkweed (Asclepias syriaca), Pennsylvania, USA, June.

Doug Wechsler / Common milkweed (Asclepias syriaca), Todd Audubon Wildlife Sanctuary, Maine, USA, July.

Doug Wechsler / Acrobat ants (Crematogaster ashmeadi) nectaring on Common milkweed (Asclepias syriaca), Pennsylvania, USA, July.

Ann & Steve Toon / Common milkweed locust (Phymateus morbillosus), Samara private game reserve, Karoo, South Africa, January

Doug Wechsler / Milkweed / Oleander aphids (Aphis nerii) on common milkweed (Asclepias syriaca). Philadelphia, PA. August

Doug Wechsler / Milkweed tussock moth / tiger moth caterpillars (Euchaetes egle) first instar and egg mass on common milkweed. Philadelphia, Pennsylvania, USA. July

Doug Wechsler / Large milkweed bug nymphs (Oncopeltus fasciatus) on common milkweed pod (Asclepias syriaca). Philadelphia, Pennsylvania, USA. July

Doug Wechsler / Long-legged Fly (Condylostylus sp.) on Common milkweed leaf, Pennsylvania, USA

Doug Wechsler / Caterpillar larva of Monarch butterfly {Danaus plexippus} on leaves of host plant Common milkweed (Asclepias syriaca) Adirondack Park, New York, USA

Marie Read / Common Redpoll (Carduelis flammea) male perched on milkweed stem (Asclepias sp) and seed pods in winter, New York, USA, against white background.

Larry Michael / Seed dispersal of Common milkweed {Asclepias syriaca} Wisconsin, USA

Doug Wechsler / Common milkweed seed pods {Asclepias syriaca} Philadelphia, USA

Philippe Clement / Seed pods of Common milkweed {Asclepias syriaca} Belgium

Michael & Patricia Fogden / Swallowtail (Papilio rhodostictus) visiting flowers of a Scarlet Milkweed (Aasclepias curassavica) rainforest ecosystem, Costa Rica

Richard Du Toit / Common milkweed locust (Phymateus morbillosus) resting on Pincushion (Leucospermum sp.) flower, Western Cape Province, South Africa.

Doug Wechsler / Oleander aphid (Aphis nerii) alates and nymphs on Common milkweed (Asclepias syriaca) leaf, Pennsylvania, USA. July.

Doug Wechsler / Red milkweed beetle (Tetraopes tetrophthalmus) mating on Common milkweed (Asclepias syriaca), Pennsylvania, Philadelphia, USA. July.

John Cancalosi / Red milkweed beetles (Tetraopes tetrophthalmus) three on Common milkweed (Asclepias syriaca) mating pair and interloper, Maryland, USA.