my childhood was spent with jars and fish tanks full of tadpoles newts etc, I never collected birds eggs but I knew where they nested and what each birds egg looked like.
Mine too.
I was fortunate that my father travelled quite a lot in his work. He would often take me on day trips with him and while he was meeting people would leave me for hours at somewhere of my choice- often in the middle of nowhere, or the public park or museum in a strange town, and pick me up at a prearranged time, later. I would spend the intervening time happily exploring a wood or peering at crayfish and newts in a pond perhaps. Never a thought of any 'danger' in those days. I also spent many whole days (opening- closing) like this 'running free' on my own in Bristol Zoo.
I can also remember catching, handling and even keeping small creatures, some of which nowadays you even need a licence to photograph, let alone touch! Sadly our children nowadays just don't get to experience that sort of freedom of exploration.