Horned Lark, Eremophila alpestris, nestlings begging, baby birds in nest, with distinct gape coloration and patterns. Horned Larks nest in open nests on the ground. 
<p>NOTE: This nest was photographed as part of a nest monitoring project in the oil fields of Alberta, Canada by a professional trained in viewing sensitive nests and minimizing the disturbance to the birds and the surrounding vegetation.
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Photographing nests simply to "snap a cute pic" can expose them to predators and disrupt the feeding and care of nestlings!
<a href="//commons.wikimedia.org/w/index.php?title=User:Kati_Fleming&amp;action=edit&amp;redlink=1" class="new" title="User:Kati Fleming (page does not exist)">Kati Fleming</a>
<span class="int-own-work" lang="en">Own work</span>