Edwin Giesbers / Hyacinth macaw (Anodorhynchus hyacinthinus) head portrait, captive, endangered

Nick Garbutt / Hyacinth Macaw (Anodorhynchus hyacinthinus) head portrait at nest hole, in forest bordering of the Cuiaba River, Northern Pantanal, Brazil. September

Nick Garbutt / Hyacinth Macaw (Anodorhynchus hyacinthinus) in forest bordering of the Cuiaba River, Northern Pantanal, Brazil. September

Christophe Courteau / Wild Hyacinth macaw (Anodorhynchus hyacinthimus) Pantanal. Brazil. Endangered, July

Mary McDonald / Hyacinth Macaws (Anodorhynchus hyacinthinus) pair perched in Palm tree, the Pantanal, Brazil, South America.

Edwin Giesbers / Tassel hyacinth (Muscari comosum) flower, Menorca, Balearic Islands, Spain, Europe

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) perched in palm tree, silhouetted at sunset, Pantanal NP, Mato Grosso, Brazil, sequence 1/3. Endangered

Pete Oxford / Hyacinth macaw in nest hole {Anodorhynchus hyacinthinus} Pantanal, Brazil

Rolf Nussbaumer / Water hyacinth covering lake {Eichhornia crassipes} Texas, USA.

Pete Oxford / Hyacinth Macaw (Anodorhynchus hyacinthinus) cracking open a Piassava Palm (Attalea funifera) nut to drink the milk, Brazil

Fred Bavendam / West Indian Manatee (Trichechus manatus) eating Hydrilla (Hydrilla sp) an introduced plant that often clogs waterways, Blue Spring State Park, Florida

Hermann Brehm / Hyacinth macaw pair {Anodorhynchus hyacinthinus} Pantanal, Brazil

Hermann Brehm / Hyacinth macaw emerging from nest hole {Anodorhynchus hyacinthinus} Pantanal, Brazil

Pete Oxford / Threatened Cerrado habitat - red sandstone cliffs, Piaui State, NE Brazil, South America - habitat for endangered Hyacinth macaw

LYNN M. STONE / Hyacinth macaw (Anodorhynchus hyacinthinus)

Pete Oxford / Hyacinth macaw holding food in claw to eat {Anodorhynchus hyancinthinus}, occurs Brazil

Robert Thompson / Owly sulphur (Libelloides coccajus) on grape hyacinth (Muscari) flower, Rugiano, Monte St Angelo, Gargano, Italy, April

Hermann Brehm / Hyacinth Macaw (Anodorhynchus hyacinthinus) eating nuts of Acari Palm, one of their favourite foods, Pantanal, Brazil

Paul Hobson / Honey bee (Apis mellifera) visiting Grape hyacinth, Sheffield, UK

Paul Hobson / Honey bee (Apis mellifera) visiting Grape hyacinth, Sheffield, UK

Paul Hobson / Honey bee (Apis mellifera) visiting Grape hyacinth, Sheffield, UK, April

Paul Hobson / Honey bee (Apis mellifera) visiting Grape hyacinth, Sheffield, UK, April

David Pattyn / Hyacinth macaws (Anodorhynchus hyacinthinus) pair courting on a tree branch just before mating, Pantanal, Brazil, August

David Pattyn / Hyacinth macaws (Anodorhynchus hyacinthinus) a couple mating on a tree branch, Pantanal, Brazil, August

David Pattyn / Hyacinth macaws (Anodorhynchus hyacinthinus) two feeding on their favourite palm nuts in grass, Pantanal, Brazil, August.

Colin Varndell / Spanish bluebell (Hyacynthoides hispanica) in flower. Dorset, UK, April.

Wild Wonders of Europe / Widstra / Tassel hyacinth (Muscari comosum) Campanarios de Azaiba Nature Reserve, Salamanca Region, Castilla y Leon, Spain

Wild Wonders of Europe / Widstrand / Tassel hyacinth (Muscari comosum) Campanarios de Azaiba Nature Reserve, Salamanca Region, Castilla y Leon, Spain

David Pattyn / Hyacinth macaws (Anodorhynchus hyacinthinus) two feeding on their favourite palm-nuts in tree, Pantanal, Brazil, August

Philippe Clement / Tassel hyacinth (Muscari comosum) in flower, La Brenne, France, May

Cheryl-Samantha Owen / Whale headed stork (Balaeniceps rex) taking off, Lake Albert, Uganda, East Africa

Adrian Davies / Tassel hyacinth (Muscari comosum) close up of flower, Mallorca (Focus stacked from 4 images), April.

Hiroya Minakuchi / Common Water Hyacinth (Eichhornia crassipes) in river, Costa Rica

Kevin Schafer / Hyacinth Macaw (Anodorhynchus hyacinthinus) in nesting hole, Pantanal, Brazil

Kevin Schafer / Hyacinth Macaw (Anodorhynchus hyacinthinus) in nesting hole, Pantanal, Brazil

LYNN M. STONE / Wild Hyacinth (Camassia scilloides), Lily Family, Kane County, Illinois, USA

Nick Upton / Spanish Bluebell (Hyacinthoides hispanica), an invasive species in the UK, flowering on coastal cliff with surf beach in the background. Near Polzeath, Cornwall, April.

Patricio Robles Gil / Hyacinth Macaw (Anodorhynchus hyacinthinus) with open beak. Parana, Southern Brazil.

Gary K. Smith / Honey Bee (Apis mellifera) foraging on Grape Hyacinth (Muscari armeniacum) showing pollen sac. UK, April.

Philippe Clement / Common Grape Hyacinths (Muscari botryoides / Hyacinthus botryoides L.) in flower. Belgium, March 2011.

Philippe Clement / Common Grape Hyacinths (Muscari botryoides / Hyacinthus botryoides L.) and Daffodils in flower in garden. Belgium, March 2011.

Luiz Claudio Marigo / Hyacinth Macaws (Anodorhynchus hyacinthinus) perched on the leaves of the Acuri palm tree (Scheelea phalerata), the main item of its diet. Endangered species. The Pantanal wetlands of Mato Grosso Stat...

Luiz Claudio Marigo / Hyacinth Macaws (Anodorhynchus hyacinthinus) perched on the leaves of the Acuri palm tree (Scheelea phalerata). The Pantanal wetlands of Mato Grosso State, Brazil, November.

Luiz Claudio Marigo / Hyacinth Macaw (Anodorhynchus hyacinthinus) perched on the leaves of the Acuri palm tree (Scheelea phalerata), the main item of its diet. Endangered species. The Pantanal wetlands of Mato Grosso State...

Luciano Candisani / Hyacinth Macaw (Anodorhynchus hyacinthinus) feeding on Bocaiuva Palm (Acrocomia sclerocarpa) fruit, Brazil

Luciano Candisani / Hyacinth Macaw (Anodorhynchus hyacinthinus) pair preening, Pantanal, Brazil

Luciano Candisani / Hyacinth Macaw (Anodorhynchus hyacinthinus) pair, Pantanal, Brazil

Luciano Candisani / Hyacinth Macaw (Anodorhynchus hyacinthinus) pair, Pantanal, Brazil

Luciano Candisani / Hyacinth Macaw (Anodorhynchus hyacinthinus) emerging from nest box installed by researcher Neiva Guedes, Pantanal, Brazil

Luciano Candisani / Hyacinth Macaw (Anodorhynchus hyacinthinus) emerging from nest box installed by researcher Neiva Guedes, Pantanal, Brazil

Luciano Candisani / Hyacinth Macaw (Anodorhynchus hyacinthinus) emerging from nest in Panama Tree (Sterculia apetala), Pantanal, Brazil

Luciano Candisani / Hyacinth Macaw (Anodorhynchus hyacinthinus) flying, Pantanal, Brazil

Nick Garbutt / Hyacinth Macaw (Anodorhynchus hyacinthinus) head portraits preening, in forest bordering of the Cuiaba River, Northern Pantanal, Brazil. September

Suzi Eszterhas / Capybara (Hydrochoerus hydrochaeris) with Smooth-billed Ani (Crotophaga ani) on its head, Pantanal, Brazil

LYNN M. STONE / Pickerel-weed (Pontederia cordata) semi-aquatic wildflower, Connecticut, USA

Kevin Schafer / Hyacinth macaw (Anodorhynchus hyacinthinus) feeding in palm tree, Pantanal, Mato Grosso, Brazil, wild, Endangered species

Gary K. Smith / Grape Hyacinth (Muscari armeniacum) in flower, England, UK, April. Cultivated plant.

Fabio Liverani / Water Hyacinth (Eichhornia crassipes) in flower, Willawilla lake, Sri Lanka

Tim Laman / The introduced pest species, Water Hyacinth (Pontederiaceae) clogging a river in the rainforest of Sabah, Borneo, Malaysia

Richard Du Toit / Hippopotamus (Hippopotamus amphibius) amongst water hyacinth in water, Okavango delta, Botswana

Miles Barton / Desert hyacinth (Cistanche tubulosa) parasitic plant with underground tuber, flowering in desert, Dubai, United Arab Emirates. Boiled stem traditionally used to cure diarrhoea. Believed to be aphrodis...

Miles Barton / Desert hyacinth (Cistanche tubulosa) parasitic plant with underground tuber, flowering in desert, Dubai, United Arab Emirates. Boiled stem traditionally used to cure diarrhoea. Believed to be aphrodis...

Miles Barton / Desert hyacinth (Cistanche tubulosa) parasitic plant with underground tuber, flowering in desert, Dubai, United Arab Emirates. Boiled stem traditionally used to cure diarrhoea. Believed to be aphrodis...

Piper Mackay / Pair of Hyacinth Macaws (Anodorhynchus hyacinthinus) courtship behaviour. Pantanal, Brazil. Endangered

Luiz Claudio Marigo / Hyacinth Macaw (Anodorhynchus hyacinthinus) fledling chick in nest in hollow tree trunk, Pantanal, Mato Grosso, Mato Grosso do Sul State, Brazil.

Luiz Claudio Marigo / Hyacinth Macaw (Anodorhynchus hyacinthinus) two chicks in nest in hollow tree trunk, Pantanal, Mato Grosso, Mato Grosso do Sul State, Center-West of Brazil.

Luiz Claudio Marigo / Hyacinth Macaw (Anodorhynchus hyacinthinus) chick in nest in hollow trunk, Pantanal, Mato Grosso, Mato Grosso do Sul State, Brazil.

Luiz Claudio Marigo / Hyacinth Macaw (Anodorhynchus hyacinthinus) two chicks in nest, Pantanal, Mato Grosso, Mato Grosso do Sul State, Brazil.

Luciano Candisani / Hyacinth Macaw (Anodorhynchus hyacinthinus) in nest entrance, Brazil

Wild Wonders of Europe / Lilja / Tassel hyacinth (Muscari comosum) flower, Limassol, Cyprus, April 2009

Stephen Dalton / Tassel hyacinth (Muscari comosum) Italy

Adrian Davies / Grape hyacinth {Muscari armeniacum} flowering in garden under Japanese flowering cherry tree {Prunus shirotae} UK

Adrian Davies / Grape hyacinth {Muscari armeniacum} flowering in garden under Japanese flowering cherry tree {Prunus shirotae} UK

Wild Wonders of Europe / Radisics / Grape hyacinth, (Muscari racemosum) in flower, Durmitor NP, Montenegro, May 2008

Suzi Eszterhas / Hyacinth Macaw (Anodorhynchus hyacinthinus) in tree cavity, Pantanal, Brazil

Suzi Eszterhas / Hyacinth Macaw (Anodorhynchus hyacinthinus) in tree cavity, Pantanal, Brazil

Suzi Eszterhas / Hyacinth Macaw (Anodorhynchus hyacinthinus) pair, Pantanal, Brazil

Suzi Eszterhas / Hyacinth Macaw (Anodorhynchus hyacinthinus) pair, Pantanal, Brazil

Michael Hutchinson / Water Hyacinth (Eichhornia crassipes) floating on lake in marsh, Esteros del Ibera, Argentina

Michael Hutchinson / Water Hyacinth (Eichhornia crassipes) in flower in marsh, Esteros del Ibera, Argentina

Philippe Clement / Field with rows of colourful cultivated Hyacinth flowers, the Netherlands, April 2009

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) flying, Pantanal NP, Mato Grosso, Brazil

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) pair perched in palm tree, Pantanal NP, Mato Grosso, Brazil. Endangered

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) pair displaying in tree with Ibis perched in background, Pantanal NP, Mato Grosso, Brazil. Endangered

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) pair displaying in tree with Ibis perched in background, Pantanal NP, Mato Grosso, Brazil. Endangered

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) pair in flight, Pantanal NP, Mato Grosso, Brazil. Endangered

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) pair perched in palm tree, Pantanal NP, Mato Grosso, Brazil. Endangered

Juan Carlos Munoz / Photographers taking photos of Hyacinth macaws perched in tree, Pantanal NP, Mato Grosso, Brazil

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) pair in flight, Pantanal NP, Mato Grosso, Brazil. Endangered

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) perched in palm tree, silhouetted at sunset, Pantanal NP, Mato Grosso, Brazil, sequence 3/3. Endangered

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) perched in palm tree, silhouetted at sunset, Pantanal NP, Mato Grosso, Brazil, sequence 2/3. Endangered

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) pair perched in tree, Pantanal NP, Mato Grosso, Brazil. Endangered

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) pair displaying in tree with Ibis perched in background, Pantanal NP, Mato Grosso, Brazil. Endangered

Juan Carlos Munoz / Hyacinth macaw (Anodorhynchus hyacinthinus) pair perched in tree, Pantanal NP, Mato Grosso, Brazil. Endangered

Luiz Claudio Marigo / Pair of Hyacinth Macaws (Anodorhynchus hyacinthinus) at nest hole, Pantanal Matogrossense, Mato Grosso do Sul State, Western Brazil.

Silvia Reiche / Feather Hyacinth (Muscari comosum) flower, Saint-Jory-las-Bloux, Dordogne, France