A Rufous-tailed hummingbird, Amazilia tzacatl, flies while approaching its nest on a tree in San Jose June 1, 2015.
Caribbean flamingos are seen in their enclosure at Antwerp's zoo, Belgium, June 1, 2015.
A butterfly is pictured on a leaf inside the Butterfly Garden at Antwerp's zoo, Belgium, June 1, 2015.
Butterflies are pictured on a leaf inside the Butterfly Garden at Antwerp's zoo, Belgium, June 1, 2015.
A seal swims in an open air aquarium at Antwerp's zoo, Belgium, June 1, 2015.
Visitors watch fishes in the Aquarium area at Antwerp's zoo, Belgium, June 1, 2015.
A Rufous-tailed hummingbird, Amazilia tzacatl, is pictured nesting in a tree in San Jose June 1, 2015.