Jack Dykinga / Saguaro cacti (Carnegiea gigantea) in bloom with Foothill paloverde (Cercidium microphyllum) Sonoran Desert National Monument, Arizona, USA, April.

Martin Gabriel / Woody / Monkey ladder vine (Bauhinia glabra) Palo Verde National Park, Costa Rica

Martin Gabriel / Woody / Monkey ladder vine (Bauhinia glabra) Palo Verde National Park, Costa Rica

Jack Dykinga / Yellow paloverde (Cercidium microphyllum) flowering amongst Saguaro (Carnegiea gigantea). In foothills on north side of Santa Catalina Mountains, Coronado National Forest, Arizona, USA. May 2019.

Jouan Rius / Rainbow over Saguaro cacti (Carnegiea gigantea), Organ Pipe Cactus (Stenocereus thurberi) and Foothills Palo Verde tree (Cercidium microphyllum), Organ Pipe Cactus National Monument, Sonoran Desert, A...

Jouan Rius / Yellow or Foothills Palo Verde tree (Cercidium microphyllum), Arizona, USA. April 2014.

Nick Hawkins / Black-bellied whistling ducks (Dendrocygna autumnalis) flock in flight, Palo Verde National Park, Costa Rica.

Nick Hawkins / Black-necked stilt (Himantopus mexicanus) reflected in water, Palo Verde National Park, Costa Rica.

Nick Hawkins / Salmon-bellied racer snake (Mastigodryas melanolomus) resting on cracked mud, Palo Verde National Park, Costa Rica, April 2014.

Cyril Ruoso / Black-chinned hummingbird (Archilochus alexandri) feeding on Foothill Palo verde (Cercidium / Parkinsonia microphyllum) nectar, Vizcaino Desert, Baja California, Mexico, May.

Cyril Ruoso / Black-chinned hummingbird (Archilochus alexandri) feeding on Foothill Palo verde (Cercidium / Parkinsonia microphyllum) nectar, Vizcaino Desert, Baja California, Mexico, May.

Gabriel Rojo / Flowers of Verde olivo (Parkinsonia praecox) Lihue Calel National Park, La Pampa, Argentina

Gabriel Rojo / Verde olivo tree (Parkinsonia praecox) in flower, Lihue Calel National Park, La Pampa, Argentina

Daniel Heuclin / Yellow Palo Verde / Foothill Palo Verde (Parkinsonia microphylla / Cercidium microphyllum) growing in habitat. Foothills of Santa Catalina mountains. Arizona, USA, September.

Martin Gabriel / Close-up of curves in Woody / Monkey ladder vine (Bauhinia glabra) Palo Verde National Park, Costa Rica

Martin Gabriel / Double-striped thick-knee (Burhinus bistriatus) pair in the swamps of Palo Verde National Park, Costa Rica

Martin Gabriel / Bare throated tiger heron (Tigrisoma mexicanum) portrait, Palo Verde National Park, Costa Rica

Martin Gabriel / Palo verde shrubs (Parkinsonia aculeata) in limestone hills, Palo Verde National Park, Costa Rica, February 2009

Martin Gabriel / Black bellied whistling ducks (Dendrocygna autumnalis) in shallow water, Palo Verde National Park, Costa Rica

Martin Gabriel / Forrer's Grass frog (Rana forreri) looking up, Palo Verde National Park, Costa Rica

Martin Gabriel / Bull thorn acacia (Acacia collinsii) with Acacia ants (Pseudomyrmex belti) on it, Palo Verde National Park, Costa Rica

Martin Gabriel / Limpkin (Aramus guarauna) pair, Palo Verde National Park, Costa Rica

Martin Gabriel / Great egrets (Ardea alba) resting in the Catalina area of Palo Verde National Park, Costa Rica, February 2009

Martin Gabriel / Harlequin snake {Scolephis atrocinctus} Palo Verde National Park, Costa Rica

Martin Gabriel / Swamps of the Rio Tempisque contrasting with dry forest of limestone hills with (Stenocereus aragonii) an endemic cactus, Palo Verde National Park, Costa Rica, February 2009

Martin Gabriel / Common pauraque (Nyctidromus albicollis) sitting on ground, Palo Verde NP, Costa Rica

Martin Gabriel / Double-striped thick-knee (Burhinus bistriatus) in the swamps of Palo Verde National Park, Costa Rica

Martin Gabriel / Roble de Sabana (Tabebuia rosea) flowering in dry season, Palo Verde National Park, Costa Rica, February 2009

Martin Gabriel / Palo verde shrubs (Parkinsonia aculeata) growing in limestone hills, Palo Verde National Park, Costa Rica, February 2009

Martin Gabriel / Great egret (Ardea alba) in the swamps of Palo Verde National Park, Costa Rica

Martin Gabriel / Black bellied whistling ducks (Dendrocygna autumnalis) Palo Verde National Park, Costa Rica

Martin Gabriel / Limestone hill in the Catalina area of in Palo Verde National Park, dry season, Costa Rica, February 2009

Martin Gabriel / Black spiny tailed iguana (Ctenosaura similis) portrait, Palo Verde National Park, Costa Rica

Martin Gabriel / Swamps of the Rio Tempisque contrasting with dry forest of limestone hills with (Stenocereus aragonii) an endemic cactus, Palo Verde National Park, Costa Rica, February 2009

Martin Gabriel / Common pauraque (Nyctidromus albicollis) portrait, Palo Verde NP, Costa Rica

Tim Fitzharris / Palo Verde Tree (Parkinsonia sp) in desert, Saguaro National Park, Arizona

Jouan & Rius / Black howler monkey (Alouatta caraya) hanging from tail, Palo Verde NP, Costa Rica

Philippe Clement / Foothill palo verde (Cercidium microphyllum) among rocks showing its smooth green bark, Saguaro NP, Arizona, USA 2007

Philippe Clement / Foothill palo verde (Cercidium microphyllum) showing its smooth green bark, Saguaro NP, Arizona, USA

Philippe Clement / Foothill palo verde (Cercidium microphyllum) among rocks showing its smooth green bark, Saguaro NP, Arizona, USA 2007

Philippe Clement / Saguaro cactus {Carnegiea gigantea} growing through branches of Foothill palo verde tree{Parkisonia / Cercidium microphyllum}, Sonoran desert, Arizona May 2007

Philippe Clement / Young Saguaro cactus {Carnegiea gigantea} growing through branches of Foothill palo verde tree {Cercidium / Parkinsonia microphyllum}, Sonoran desert, Arizona

Philippe Clement / Saguaro cactus {Carnegiea gigantea} growing through branches of Foothill palo verde tree {Cercidium / Parkinsonia microphyllum}, Sonoran desert, Arizona

Philippe Clement / Saguaro cactus {Carnegiea gigantea} growing through branches of Foothill palo verde tree {Cercidium / Parkinsonia microphyllum}, Sonoran desert, Arizona

Philippe Clement / Aerial view of Palo Verde NP wetlands, Costa Rica, Central America

Philippe Clement / Bare throated tiger heron (Tigrisoma mexicanum) stalking prey in swamp, Palo Verde NP, Costa Rica

Philippe Clement / Twisted lianas in Palo Verde NP, Costa Rica

Philippe Clement / Bare throated tiger heron (Tigrisoma mexicanum) stalking prey in swamp, Palo Verde NP, Costa Rica

Philippe Clement / Twisted Lianas in Palo Verde NP, Costa Rica

Philippe Clement / American wood ibis / storks (Mycteria americana) flying, Palo Verde NP, Costa Rica

Philippe Clement / Bare throated tiger heron (Tigrisoma mexicanum) in swamp, Palo Verde NP, Costa Rica

Philippe Clement / Northern jacana (Jacana spinosa) foraging in swamp, Palo Verde NP, Costa Rica

Philippe Clement / Red-cheeked mud turtle (Kinosternon scorpioides), Palo Verde NP, Costa Rica

Philippe Clement / Northern jacana (Jacana spinosa) foraging in swamp, Palo Verde NP, Costa Rica

Tom Vezo / Gila Woodpecker (Melanerpes uropygialis) female perched in Palo Verde (Parkinsonia sp) tree, Green Valley, Arizona

Tom Vezo / Broad-billed Hummingbird (Cynanthus latirostris) male perched in Palo Verde (Parkinsonia sp) tree, Green Valley, Arizona

Juan Manuel Borrero / Spiny iguana {Ctenosaura similis} Palo Verde NP, Costa Rica

Dietmar Nill / Mantled howler monkey {Alouatta palliata} eating with food in hand, Palo Verde, Costa Rica

Dietmar Nill / Tree in tropical dry forest, Palo Verde NP, Guanacaste, Costa Rica

Philippe Clement / Greater white lined bat {Saccopteryx bilineata} roosting in building, Palo Verde NP, Costa Rica.

Tim Fitzharris / Ocotillo (Fouquieria splendens) Saguaro (Carnegiea gigantea) Greasewood (Sarcobatus sp) and Palo Verde (Parkinsonia sp), Arizona

Dietmar Nill / Mantled Howler Monkey. (Alouatta palliata) Costa Rica. Palo Verde.

Denis-Huot / Boat tailed grackle (Quiscalus major) calling, Palo Verde National park, Central America, Costa-Rica

Michael & Patricia Fogden / Gumbo Limbo (Bursera simaruba) bark peeling off trunk, Palo Verde National Park, Costa Rica

Dietmar Nill / Mantled Howler Monkey. (Alouatta palliata) Costa Rica. Palo Verde.

Dietmar Nill / Mantled Howler Monkey. (Alouatta palliata) Costa Rica. Palo Verde.

Tim Fitzharris / Palo Verde (Cercidium sp) blooming, Joshua Tree National Park, California

Jack Dykinga / Saguaro cacti (Carnegiea gigantea) in flower beside flowering Foothills paloverde (Parkinsonia microphylla), Santa Catalina Mountains, Arizona, USA, May 2023.

Jack Dykinga / Saguaro cacti (Carnegiea gigantea) in flower beside flowering Foothills paloverde (Parkinsonia microphylla), Santa Catalina Mountains, Arizona, USA, May 2023.

Gabriel Rojo / Monk parakeet (Myiopsitta monachus) perched on a branch of flowering Chanar (Geoffroea decorticans), Calden forest, La Pampa province, Patagonia, Argentina.

Gabriel Rojo / Monk parakeet (Myiopsitta monachus) perched on a branch of flowering Chanar (Geoffroea decorticans), Calden forest, La Pampa province, Patagonia, Argentina.

Gabriel Rojo / Bay-winged cowbird (Agelaioides badius) perched on branch of flowering Chanar (Geoffroea decorticans), Calden forest, La Pampa, Patagonia, Argentina.

Gabriel Rojo / Monk parakeet (Myiopsitta monachus) perched on a branch of flowering Chanar (Geoffroea decorticans), Calden forest, La Pampa province, Patagonia, Argentina.

Gabriel Rojo / Blue and yellow tanager (Thraupis bonariensis), perched on a branch of flowering Chanar (Geoffroea decorticans), Calden Forest, La Pampa, Patagonia, Argentina.

Tui De Roy / Galapagos doves (Zenaida galapagoensis) feeding on flowers of Parkinsonia shrub, Espanola Island, Galapagos Islands, Ecuador.

Jack Dykinga / Blue palo verde (Parkinsonia florida) tree with blue-green bark, covered in yellow flowers , Sonoran desert, Arizona, USA.

John Cancalosi / Great horned owl (Bubo virginianus) perched in Parkinsonia (Palo verde) tree, Sonoran Desert, Arizona, USA.

John Cancalosi / Cactus wren (Campylorhynchus brunneicapillus) on Saguaro cactus (Carnegiea gigantea) in bloom with Palo verde (Parkinsonia microphylla) in background, Sonoran desert, Arizona. Photo showing Arizona...

Jack Dykinga / Saguaro cactus (Carnegiea gigantea) beneath Palo verde (Cercidium microphyllum) nurse tree, scorched by Big Horn Fire, a wildfire caused by a lightning strike on 5th June 2020 which burnt for six week...