Michael Durham / A three year old boy with a Pacific Tree Frog (Pseudacris regilla)

Michael Durham / Pacific Chorus Frog (Pseudacris regilla) jumping into pond, Oregon

Cyril Ruoso / Pacific tree frog (Pseudacris regilla) male calling with vocal sac inflated, Conboy Lake National Wildlife Refuge, Washington, USA. March.

Cyril Ruoso / Pacific tree frog (Pseudacris regilla) male calling with vocal sac inflated, Conboy Lake National Wildlife Refuge, Washington, USA. March.

Cyril Ruoso / Pacific tree frog (Pseudacris regilla) male calling with vocal sac inflated, Conboy Lake National Wildlife Refuge, Washington, USA. March.

Cyril Ruoso / Pacific tree frog (Pseudacris regilla) male calling with vocal sac inflated, Conboy Lake National Wildlife Refuge, Washington, USA. March.

Cyril Ruoso / Pacific tree frog (Pseudacris regilla) next to reeds at twilight, Conboy Lake National Wildlife Refuge, Washington, USA. March.

James Christensen / Pacific Chorus Frog (Pseudacris regilla) female hiding in creek bed, Eagle Cap Wilderness, Oregon

Chris Mattison / Pacific Tree Frog or Pacific Chorus Frog (Pseudacris regilla) Golden Bluffs, California, USA, April.

Donald M. Jones / Pacific Tree Frog (Hyla regilla), northwestern Montana

Donald M. Jones / Pacific Tree Frog (Hyla regilla) hiding in Ponderosa Pine (Pinus ponderosa) tree bark, western Montana

Cyril Ruoso / Pacific Chorus Frog (Pseudacris regilla) male calling, Conboy Lake National Wildlife Refuge, Washington