We wondered why the terns were not breeding successfully one year and discovered that a fox was listening to the chicks calling from inside their eggshells just before hatching.
Kādu gadu mēs brīnījāmies, kāpēc zīriņiem slikti veicas ar mazuļu perēšanu, un atklājām, ka lapsa klausījās skaņās, ko putnēni izdod īsi pirms izšķilšanās.