praecoces

from The Century Dictionary.

• Precocial birds; in some systems, as Bonaparte's, a prime division of the class Aves, including those birds whose young are able to run about and feed themselves as soon as they are hatched: opposed to Altrices, and synonymous with Grallatores in one sense.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) A division of birds including those whose young are able to run about when first hatched.