Humans use a variety of cues to gauge an object’s weight without directly handling it, including how easily it can be moved. For instance, if we see one object blowing down the street in the wind while another object remains stationary, we can infer which object is heavier.
But what about other animals? I take a look at a clever new experiment with New Caledonian crows that suggests they possess this ability, too.
Read it here: Observant Crows Make Weighty Decisions.