Pascal Pittorino / Mimosa (Acacia dealbata) flowers covered in snow , Var, Provence, France, February

Dave Watts / Prickly moses (Acacia verticillata). Tasmania, Australia. October.

Dave Watts / Black wattle (Acacia mearnsii). Tasmania, Australia. December.

Cyril Ruoso / Bull horn acacia (Acacia sp), close up of thorn. The hollow thorn can provide a nest site to Ants (Pseudomyrmex sp). Osa Peninsula, Costa Rica.

Will Watson / Mourning Collared Dove (Streptopelia decipiens) on Whistling thorn (Acacia drepanolobium), Samburu National Reserve, Kenya. January.

Jack Dykinga / Towering elegant curving red sand dunes rising above acacia trees. Sossusevlei, World Heritage Site, Namibia

Jack Dykinga / Red sand dunes towering over Acacia trees (Acacia pechuelii) at dawn, Sossusvlei, Namib Naukluft Park, Namibia, Africa.

Oriol Alamany / Acacia trees below a sand dune in Tscauchab valley, Namib-Naukluft National Park, Namibia, October

Rhonda Klevansky / Acacia mellifera flower, Erongo Mountain conservancy, Namibia

Rhonda Klevansky / Acacia mellifera flower, Erongo Mountain conservancy, Namibia

Edwin Giesbers / Orange wattle (Acacia saligna) hanging branches with flowers and leaves. Cyprus. April.

Edwin Giesbers / Orange wattle (Acacia saligna) hanging branches with flowers and leaves. Cyprus. April.

Steven David Miller / Sulphur-crested cockatoo (Cacatua galerita) feeding on seedpods in Flax wattle (Acacia linifolia) tree. Lane Cove National Park, Sydney, New South Wales, Australia.

Tony Heald / Elephant (Loxodonta africana), male standing on hind legs to reach acacia pods with Cattle egrets (Bubulcus ibis) in background. Mana Pools National Park, Zimbabwe.

Tony Heald / Elephant (Loxodonta africana), male standing on hind legs to reach acacia pods. Cattle egrets (Bubulcus ibis) around elephant's feet. Mana Pools National Park, Zimbabwe.

Tony Heald / Elephant (Loxodonta africana) shaking tree for acacia pods with forest in background. Mana Pools National Park, Zimbabwe. November 2017.

Emanuele Biggi / Sand dunes and Acacia trees, Sossusvlei, Namibia, June 2017.

Emanuele Biggi / Sossusvlei's dunes and acacia trees, Sossusvlei area, Namibia, January 2017.

Jiri Lochman / Plant biodiversity on stabilized coastal dunes with Shark Bay Rose (Diplolaena grandiflora) and Sandhill Wattle (Acacia ligulata) in the foreground, Shark Bay UNESCO Natural World Heritage Site, Weste...

Luke Massey / Acacia logs being transported, Balikpapan, Indonesia

Luke Massey / Acacia logs being transported, Balikpapan, Indonesia

Luke Massey / Acacia logs being transported, Balikpapan, Indonesia

Ingo Arndt / Whistling thorn tree (Acacia drepanolobium) in open Savanna Grassland under storm clouds, Masai Mara National Reserve, Kenya

Julian Hume / Illustration of extinct O'ahu koa finch (Rhodacanthis litotes) in a Koa (Acacia koa) Hawaii.

Wim van den Heever / Sunset over savanna landscape image with a lone (Acacia) tree, Masai Mara NR, Kenya

Wim van den Heever / Sunset over savanna landscape image with a lone (Acacia) tree, Masai Mara NR, Kenya

Ingo Arndt / Sunrise in the Masai Mara National Reserve, with Whistling Thorn (Acacia drepanolobium) tree in picture, Kenya

Ingo Arndt / Acacia tree at sunrise on savannah, Masai Mara Game Reserve, Kenya

Nick Turner / River Eye at Greystones Farm, Gloucestershire Wildlife Trust (GWT), Nature Reserve, Gloucestershire, UK. Riverbank restored with hazel wattles to desilt river. June 2016.

Nick Turner / River Eye at Greystones Farm, Gloucestershire Wildlife Trust (GWT), Nature Reserve, Gloucestershire, UK. Riverbank restored with hazel wattles to desilt river. June 2016.

Nick Turner / River Eye at Greystones Farm, Gloucestershire Wildlife Trust (GWT), Nature Reserve, Gloucestershire, UK. Riverbank restored with hazel wattles to desilt river. June 2016.

Nick Turner / River Eye at Greystones Farm, Gloucestershire Wildlife Trust (GWT), Nature Reserve, Gloucestershire, UK. Riverbank restored with hazel wattles to desilt river. June 2016.

Nick Turner / River Eye at Greystones Farm, Gloucestershire Wildlife Trust (GWT), Nature Reserve, Gloucestershire, UK. Riverbank restored with hazel wattles to desilt river. June 2016.

Nick Turner / River Eye at Greystones Farm, Gloucestershire Wildlife Trust (GWT), Nature Reserve, Gloucestershire, UK. Riverbank restored with hazel wattles to desilt river. June 2016.

Nick Turner / Milky way and Acacia tree over De Hoop Nature Reserve, Western Cape, Overberg, South Africa. June 2013.

Nick Turner / Milky way and Acacia tree over De Hoop Nature Reserve, Western Cape, Overberg, South Africa. June 2013.

Anup Shah / Silhouette of Acacia tree at sunrise, Maasai Mara National Reserve, Kenya. December

Constantinos Petrinos / Acacia tree with beehives in the Konso Special Woreda District, Great Rift Valley, Ethiopia, Africa, March 2009.

Pascal Pittorino / Mimosa (Acacia dealbata) flowers, in botanic garden, Var, Provence, France, February.

Cheryl-Samantha Owen / Flat-top acacia tree (Acacia abyssinica or Vachellia abyssinica) over a dirt road, Tarangire National Park, Tanzania.

Fred Olivier / Close-up of an African bush elephant (Loxodonta africana) feeding, stripping vegetation from an Acacia tree with its trunk, Serengeti NP, Tanzania.

Fred Olivier / African bush elephants (Loxodonta africana) feeding, stripping vegetation from an Acacia tree with its trunk, Serengeti NP, Tanzania.

Charlie Summers / Flat top acacia tree (Acacia abyssinica) damaged by elephants. Elephants get moisture by feeding on the bark.

Denis-Huot / Olive baboon (Papio anubis) feeding in Acacia tree after the rains, Meru National Park, Kenya.

Andy Trowbridge / North Island Kokako (Callaeas wilsoni) perched in tree (Coprosma species), showing diagnostic blue fleshy wattles. Tiritiri Matangi Island, Auckland, New Zealand. September. ENDANGERED SPECIES.

Ann & Steve Toon / Young male impala (Aepyceros melampus) behind acacia bush, Pilanesberg game reserve, North West province, South Africa, February

Brent Stephenson / Juvenile Masked lapwing (Vanellus miles) showing mottled back pattern and small pale facial wattles. Cape Kidnappers, Hawkes Bay, New Zealand, October.

Brent Stephenson / Adult female Kokako (Callaeas wilsoni) perched in a shrub showing the distinctive strong legs, black zoro mask and blue wattles of this species. Tiritiri Matangi Island, Auckland, New Zealand, October...