"Tree cavities" refers to the hollow spaces or holes found inside trees. These cavities can be natural or formed due to decay or damage. They are important as they provide shelter for various animals like birds, bats, and insects, offering them a safe place to live and raise their young.
Full definition
Each colony can hold a few hundred ants, spread over several nests
in tree cavities.
With this approach, the author was able to identify the physical attributes
of tree cavities that foiled a suite of nest attackers from woodpeckers to dormice.»
Our smallest diving duck, the incredibly cute little Bufflehead, nests only
in tree cavities.
In the summer, most species split into separate female and male roosts (in buildings,
tree cavities, under bridges, caves), where the males just chill out whilst the females busily gather insects to raise their baby.
They're often found in large flocks that can reach over 100 birds, though mating pairs will fly off to find
a tree cavity to nest in come breeding season.
California condors most often nest in caves or crevices in rock faces, and
tree cavities.