Highlight what is known of nests and nesting in ornithopods.
a) Ornithopods are known to construct elaborate nests using twigs and leaves, often in communal settings, to protect their eggs and offspring.
b) Fossil evidence suggests that some ornithopods created simple burrow nests in the ground to shield their eggs from predators and harsh environmental conditions.
c) Limited fossil evidence indicates that some ornithopods may have constructed shallow nests with vegetation for egg incubation, similar to certain modern birds.
d) Detailed fossilized nests with eggs and juveniles have been discovered, providing insights into the nesting behavior, incubation periods, and parental care of some ornithopods.
