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