A new research details how angiosperms appeared and became dominant during the age of dinosaurs and how they have changed over time
Mexican Jays (Aphelocoma wollweberi) distinguish between heavier and lighter peanuts by shaking the nuts in their beaks, which allows them to 'feel' nut heaviness, the findings showed.
"When we presented the jays with ten empty and ten full identically looking pods (pods without or with three nuts inside), we noticed that after picking them up, the birds rejected the empty ones and accepted the full peanuts, without opening them," said corresponding author of the study Sang-im Lee of Seoul National University, South Korea.
The study was carried out in Arizona in the US by an international research team from Poland and South Korea.