bdcr_count(): count available records for a taxon.bdcr_count_batch(): count records for multiple
taxa.bdcr_occurrences(): download occurrence records for a
taxon.bdcr_occurrences_batch(): download occurrence records
for multiple taxa.bdcr_species_search(): search taxonomic information in
the BIE index.bdcr_quality_check(): evaluate record quality and
assign flags.